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DHT_Simulator
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‎sketches/DHT_Simulator/.arduino-ci.yml‎

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platforms:
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rpipico:
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board: rp2040:rp2040:rpipico
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package: rp2040:rp2040
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gcc:
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features:
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defines:
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- ARDUINO_ARCH_RP2040
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warnings:
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flags:
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packages:
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rp2040:rp2040:
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url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
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compile:
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# Choosing to run compilation tests on 2 different Arduino platforms
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platforms:
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- uno
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# - due
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# - zero
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# - leonardo
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- m4
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- esp32
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- esp8266
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# - mega2560
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- rpipico
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‎sketches/DHT_Simulator/.github/FUNDING.yml‎

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# These are supported funding model platforms
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github: RobTillaart
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‎sketches/DHT_Simulator/.github/workflows/arduino-lint.yml‎

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name: Arduino-lint
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on: [push, pull_request]
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jobs:
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lint:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: arduino/arduino-lint-action@v1
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with:
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library-manager: update
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compliance: strict

‎sketches/DHT_Simulator/.github/workflows/arduino_test_runner.yml‎

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---
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name: Arduino CI
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on: [push, pull_request]
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jobs:
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runTest:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: ruby/setup-ruby@v1
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with:
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ruby-version: 2.6
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- run: |
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gem install arduino_ci
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arduino_ci.rb

‎sketches/DHT_Simulator/.github/workflows/jsoncheck.yml‎

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name: JSON check
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on:
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push:
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paths:
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- '**.json'
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pull_request:
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jobs:
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test:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- name: json-syntax-check
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uses: limitusus/json-syntax-check@v1
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with:
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pattern: "\\.json$"
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‎sketches/DHT_Simulator/LICENSE‎

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MIT License
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Copyright (c) 2014-2021 Rob Tillaart
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Copyright (c) 2014-2022 Rob Tillaart
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal

‎sketches/DHT_Simulator/README.md‎

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[![Arduino CI](https://github.com/RobTillaart/DHT_Simulator/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
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[![Arduino-lint](https://github.com/RobTillaart/DHT_Simulator/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/DHT_Simulator/actions/workflows/arduino-lint.yml)
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[![JSON check](https://github.com/RobTillaart/DHT_Simulator/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/DHT_Simulator/actions/workflows/jsoncheck.yml)
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[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/DHT_Simulator/blob/master/LICENSE)
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[![GitHub release](https://img.shields.io/github/release/RobTillaart/DHT_Simulator.svg?maxAge=3600)](https://github.com/RobTillaart/DHT_Simulator/releases)
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# DHT_Simulator
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Arduino sketch to simulate a DHT22 temperature and humidity sensor.
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## Description
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The DHT22 is an often used sensor and many libraries are written for it
@@ -17,15 +21,20 @@ I wrote a simulator for the DHT sensors in 2014.
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The simulator can be used to test applications to that use a DHT sensor,
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e.g. to get high alarm temp or whatever.
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Currently the code uses two analog ports to get a value for temperature
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and humidity. Just connect two potmeters to play and simulate increase and
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Currently the code uses two analogue ports to get a value for temperature
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and humidity. Just connect two potentiometers to play and simulate increase and
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decrease of the temperature and humidity.
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## 2022-11-01
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- add RP2040 to build-CI
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- update license
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## 0.2.1
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- added pin to trigger CRC errors
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- added temp and hum pin for input for CI
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- added pins for CRC error, pulselength error and timeout error
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- added pins for CRC error, pulse length error and timeout error
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(to be tested in detail)
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The simulator is not tested extensively so please report bugs.
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## Future
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1) use the simulator-core as a bridge to other sensors.
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Idea is to use the code of the simulator in combination with a
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Senserion or two separate sensors (DS18B20 + ? ) to provide an
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Sensirion or two separate sensors (DS18B20 + ? ) to provide an
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accurate temperature and humidity. These could then be readable
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with any DHT library with the performance of a DHT (~ 5ms).
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(when time permits)
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2) implement a recorder mode, to be able to replay a certain
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behavior time after time.
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behaviour time after time.
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## Operation
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‎sketches/DHT_Simulator/examples/DHT_Simulator/DHT_Simulator.ino‎

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//
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// FILE: DHT_simulator.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// PURPOSE: Simulation of the DHT protocol
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// DATE: 2014-06-14
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// URL: https://github.com/RobTillaart/DHT_Simulator
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// TODO
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// - split loop into some functions?
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// SET ACTUAL PINS PER PLATFORM
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const int dataPin = 5; // connect to MCU ( !! also connect GND !! )
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const int CRCPin = 6; // connect switch to simulate CRC errors.
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const int TimeOutPin = 7; // connect switch to simulate timeout errors.
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const int PulseLenPin = 8; // connect switch to simulate pulselength errors.
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#if defined(__AVR__)
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const int humPin = A0; // analog pins for potmeters.
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const int tempPin = A2;
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#elif defined(ESP32)
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const int humPin = 14;
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const int tempPin = 15;
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#elif defined(ESP8266)
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const int humPin = 2;
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const int tempPin = 3;
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#else // CI
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const int humPin = A0;
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const int tempPin = A2;
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#endif
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// DATA TO SEND
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byte b[5]; // actual bytes sent
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int humidity; // humidity * 10 - prevent float operations
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int temperature; // temperature * 10
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// CONFIGURE
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const bool randomize = true; // use random generator
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const bool debug = false; // test data generation
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bool CRCerror = false; // inject CRC error
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bool TimeOutError = false; //
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bool PulseLenError = false; //.
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uint32_t count = 0; // count values per second generated
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uint32_t lastTime = 0; // keep track of timing
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/////////////////////////////////////////
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void setup()
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{
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Serial.begin(115200);
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Serial.print("Start ");
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Serial.println(__FILE__);
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pinMode(dataPin, INPUT_PULLUP);
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pinMode(CRCPin, INPUT_PULLUP);
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pinMode(TimeOutPin, INPUT_PULLUP);
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pinMode(PulseLenPin, INPUT_PULLUP);
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}
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void loop()
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{
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yield(); // keep ESP happy
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count++;
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uint32_t now = millis();
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if (now - lastTime >= 1000)
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{
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uint32_t nps = round((1000.0 * count) / (now - lastTime));
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Serial.print("DATA PER SECOND: ");
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Serial.println(nps);
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lastTime = now;
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count = 0;
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}
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if (randomize)
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{
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humidity = random(20, 1000);
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temperature = random(-200, 1800);
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}
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else
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{
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analogRead(humPin);
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humidity = analogRead(humPin);
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analogRead(tempPin);
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temperature = analogRead(tempPin) * 2 - 200;
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}
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humidity = constrain(humidity, 0, 1000);
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temperature = constrain(temperature, -200, 1800);
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if (debug)
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{
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Serial.print(humidity);
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Serial.print("\t");
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Serial.print(temperature);
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Serial.println();
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}
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// READ "ERROR" PINS
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CRCerror = digitalRead(CRCPin) == LOW;
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TimeOutError = digitalRead(TimeOutPin) == LOW;
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PulseLenError = digitalRead(PulseLenPin) == LOW;
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// WAKE UP SIGNAL DETECTED
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if (digitalRead(dataPin) == LOW)
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{
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uint32_t start = micros();
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// wait max 1500 us until signal goes high
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while (digitalRead(dataPin) == LOW)
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{
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if (micros() - start > 1500)
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{
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// Serial.println("ERROR: low puise too long");
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return;
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}
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}
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if (micros() - start > 500) // serious request...
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{
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DHTsend(humidity, temperature);
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Serial.print(humidity);
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Serial.print("\t");
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Serial.print(temperature);
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Serial.print("\t");
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for (int i = 0; i < 5; i++)
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{
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if (b[i] < 0x10) Serial.print('0');
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Serial.print(b[i], HEX);
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Serial.print(' ');
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}
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Serial.println();
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}
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else
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{
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Serial.println("ERROR: low puise too short");
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}
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}
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}
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void DHTsend(int H, int T)
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{
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pinMode(dataPin, OUTPUT);
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// SEND ACK
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digitalWrite(dataPin, LOW);
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delayMicroseconds(80); // 80 us
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digitalWrite(dataPin, HIGH);
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delayMicroseconds(80); // 80 us
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if (TimeOutError)
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{
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delayMicroseconds(100); // inject extra 100 microseconds
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}
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// PREPARE DATA
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b[0] = H / 256;
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b[1] = H & 255;
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b[2] = 0;
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if (T < 0)
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{
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T = -T;
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b[2] = 0x80;
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}
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b[2] |= T / 256;
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b[3] = T & 255;
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// CRC
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b[4] = b[0] + b[1] + b[2] + b[3];
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if (CRCerror) b[4]++; // inject CRC error
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// SEND DATA
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for (int i = 0; i < 5; i++)
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{
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DHTsendbyte(b[i]);
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}
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// END OF TRANSMISSION SIGNAL
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digitalWrite(dataPin, LOW);
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delayMicroseconds(50); // 50 us
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pinMode(dataPin, INPUT_PULLUP);
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}
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// timing manual tuned
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void DHTsendbyte(byte b)
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{
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byte mask = 128;
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for (int i = 0; i < 8; i++)
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{
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digitalWrite(dataPin, LOW);
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delayMicroseconds(45); // 50 us
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if (PulseLenError)
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{
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delayMicroseconds(10); // inject extra pulselength // TWEAK amount
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}
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digitalWrite(dataPin, HIGH);
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if (b & mask) delayMicroseconds(60); // 70 us
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else delayMicroseconds(24); // 26 us
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mask >>= 1;
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}
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}
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// -- END OF FILE --

‎sketches/DHT_Simulator/examples/DHT_Simulator/readme.txt‎

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2020-12-19
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This is a copy of the .ino file from the root folder.
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It is placed here so Arduino-CI will compile it.
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TODO - check if github can work with symbolic links.
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