make the 8 channel preheat only change the current during the script.

Author: ryanthecoder

api/src/opentrons/config/defaults_ot3.py

@@ -166,7 +166,7 @@
         OT3AxisKind.X: 0.5,
         OT3AxisKind.Y: 0.5,
         OT3AxisKind.Z: 0.1,
-        OT3AxisKind.P: 1.0,
+        OT3AxisKind.P: 0.3,
         OT3AxisKind.Z_G: 0.2,
     },
 )

hardware-testing/hardware_testing/protocols/8ch_preheat.py

@@ -37,6 +37,10 @@ def add_parameters(parameters: ParameterContext) -> None:
 requirements = {"robotType": "Flex", "apiLevel": "2.21"}
 
 
+async def change_current(self, current: float) -> None:
+    await self._backend.set_active_current({Axis.P_L: current})
+
+
 async def read_sensor(self, sensor: EnvironmentSensor) -> float:  # noqa: ANN001
     """Read and return the current sensor information."""
     s_driver = SensorDriver()
@@ -60,6 +64,7 @@ def run(ctx: ProtocolContext) -> None:
     ot3api = ctx._core.get_hardware()
     if not ctx.is_simulating():
         OT3API.read_sensor = read_sensor  # type: ignore [attr-defined]
+        OT3API.change_current = change_current  # type: ignore [attr-defined]
     primary = EnvironmentSensor.build(
         sensor_id=SensorId.S0,
         node_id=NodeId.pipette_left,
@@ -72,6 +77,7 @@ def run(ctx: ProtocolContext) -> None:
         f"flex_8channel_{ctx.params.model_type}", "left"  # type: ignore [attr-defined]
     )
     if not ctx.is_simulating():
+        ot3api.change_current(1.0)
         current_temp_1 = ot3api.read_sensor(primary)
         current_temp_2 = ot3api.read_sensor(secondary)
         get_motors_hot(ot3api)  # type: ignore [arg-type]
@@ -82,3 +88,4 @@ def run(ctx: ProtocolContext) -> None:
             current_temp_2 = ot3api.read_sensor(secondary)
             avg_temp = (current_temp_1 + current_temp_2) / 2
             ctx.delay(seconds=15, msg=f"Current temperature {avg_temp} target={target}")
+        ot3api.change_current(0.3)