[ECU] Update requirements

Author: AksonovSergei

docs/platform/ecu/requirements-chassis-ecu-stm32.md

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+# Requirements for the Chassis Controller PCB
+
+1. The controller should be designed as an expansion board for the STM32F407G-DISC1 development board.
+2. The controller should be powered by an external power source with a voltage range of 6V to 30V.
+3. The controller should have protection against reverse polarity connection of the power source.
+4. Screw terminal blocks should be used for power connections.
+5. The controller should measure the input voltage of the power source.
+6. The controller should have a buzzer controlled by MCU.
+7. The controller should have 4 groups of output signals for motor control. Connector type: JST PH.  
+   Signals in each group:
+   - PWM with a frequency up to 20 kHz. Logic level 5V.
+   - Forward (F) — logic output for direction control. Logic level 5V.
+   - Reverse (R) — logic output for direction control. Logic level 5V.
+   - GND.
+8. The controller should have 4 groups of inputs for encoders. Connector type: JST PH.  
+   Signals in each group:
+   - +5V — encoder power supply.
+   - GND.
+   - Phase A — signal from the encoder for tracking position or rotation. Used to determine the direction of movement along with the Phase B signal.
+   - Phase B — signal working together with Phase A for precise determination of direction and number of rotations. By alternating the signals of phases A and B, both speed and direction of movement can be determined.
+9. The controller should have on board 4 status blue LEDs. The current through the LED should be limited to 15 mA. Connector type: JST PH.
+10. The controller should have an output for connecting 3 external status LEDs (red, yellow, green). The current through each LED should be limited to 15 mA. Connector type: JST PH.
+11. The controller should have a serial interface connector at TTL levels. Connector type: JST PH.
+12. The controller should have 2 inputs for HC-SR04 ultrasonic sensors. Connector type: JST PH.  
+   Signals for each sensor:
+   - VCC — sensor power supply (+5V).
+   - GND — ground.
+   - TRIG — input signal to trigger the ultrasonic wave. The controller sends a short pulse (10 microseconds) to activate the measurement.
+   - ECHO — output signal indicating the return time of the reflected ultrasonic wave. The duration of this signal is proportional to the distance to the object.
+13. The controller should have the MPU-6050 (IMU) module.
+14. The controller should have a serial interface connector at TTL level with 5V power for external GPS sensor. Connector type: JST PH. 
+15. The controller shopuld have connector for external compas connected over I2C interface. Connector type: JST PH.
+16. The dimensions of the controller board should not exceed 110x190 mm. Preferably, but not necessarily, not exceed 100x100 mm.
+17. The number of PCB layers should not exceed 4. Preferably 2.
+18. The controller board should have 4 holes with a diameter of 3.2 mm at the corners for mounting to the chassis.
+19. All SMD components should be placed on the side of the STM32F407G-DISC1 board connector.
+20. All connectors for connecting modules, signals, and power should be located on the opposite side of the STM32F407G-DISC1 board.
+21. The printed circuit board should be designed using KiCad EDA (https://www.kicad.org/).
+22. All components of the board should be available for order on the website: https://www.lcsc.com/