analog_shield Namespace Reference

Analog Shield library for the Phyduino Pico, in MicroPython. More...

Classes
class	Led
	One of the shield's LEDs, D1 (green) or D2 (red). More...
class	Encoder
	The shield's rotary encoder (ENC1) and its push switch. More...

Functions
	version ()
	Gets the library version.
	encoder ()
	Gets the shield's rotary encoder.
	set_output_pin (name)
	Selects the pin the amplifier's output is read on, to match jumper JP2.
	set_supply_volts (volts=5.0)
	Sets the voltage of the shield's +5V rail, for a more accurate offset.
	amplifier_gain ()
	The amplifier's (U2A) gain, from the shield's resistor values.
	amplifier_offset_volts ()
	The voltage the amplifier (U2A) takes off its output.
	output_volts ()
	Reads the signal at the end of the chain (TEMP_SIG) on A3 or A0.
	amplifier_volts ()
	Works out the amplifier's output (OPA_OUT), before the R14/R15 divider.
	sensor_volts ()
	Works out the sensor's voltage (SENSOR_IN) from the amplifier's output.
	raw_sensor_volts ()
	Reads the sensor's voltage (SENSOR_IN) directly, on A1.
	temperature_from_volts (volts)
	Converts an LMT84 output voltage to a temperature.
	temperature ()
	Reads the on-board LMT84 temperature sensor through the amplifier.
	pot_volts ()
	Reads the potentiometer, RV1, on A5.

Variables
	green_led = Led("D6")
	The green LED, D1 on the shield, on pin D6: a Led object.
	red_led = Led("D5")
	The red LED, D2 on the shield, on pin D5: a Led object.

Detailed Description

Analog Shield library for the Phyduino Pico, in MicroPython.

Copy this file to the board next to your own main.py, then:

import analog_shield as shield
 
shield.green_led.on()
print(shield.temperature())  # degrees C, from the on-board LMT84
print(shield.encoder().position())

Needs the Phyduino Pico firmware, which has phyduino.py built in. Set the shield's jumpers for a 3.3 V board: JP3 (VIO) on 3.3 V, JP4 on 5 V, JP1 on INT and JP2 on EXT (the amplifier to A3).

Shield part	Pin
Green LED (D1), red LED (D2)	D6, D5 (both on when low)
Encoder A, B, push switch	D3, D4, D2 (low when closed)
Amplifier output	A3 (JP2 on EXT) or A0 (JP2 on INT)
Sensor voltage before the amplifier	A1
Potentiometer RV1	A5

Licence: GPL-3.0.