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https://github.com/gandro/micropython-m5stamp-c3u
Micropython modules for the M5Stamp C3U
https://github.com/gandro/micropython-m5stamp-c3u
bh1750fvi esp32-c3 m5stack m5stamp-c3u micropython qmp6988 sgp30 sht30
Last synced: about 1 month ago
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Micropython modules for the M5Stamp C3U
- Host: GitHub
- URL: https://github.com/gandro/micropython-m5stamp-c3u
- Owner: gandro
- License: mit
- Created: 2022-07-02T12:30:17.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-03-19T07:46:28.000Z (over 1 year ago)
- Last Synced: 2023-04-13T11:10:33.595Z (over 1 year ago)
- Topics: bh1750fvi, esp32-c3, m5stack, m5stamp-c3u, micropython, qmp6988, sgp30, sht30
- Language: Python
- Homepage:
- Size: 39.1 KB
- Stars: 3
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
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README
# micropython-m5stamp-c3u
This repository contains examples for the
[M5Stamp C3U](https://docs.m5stack.com/en/core/stamp_c3u) development board.
All drivers are written in pure [Micropython](https://micropython.org/) and are
intended to be used with the generic Micropython build for ESP32-C3-USB-based
boards.
Some of the modules in this repository make use of [`micropython.const`][const]
to optimize memory usage when deployed in [pre-compiled bytecode][mpy] form.
[const]: http://docs.micropython.org/en/latest/library/micropython.html#micropython.const
[mpy]: http://docs.micropython.org/en/latest/reference/mpyfiles.html
## Getting Started with Micropython
This section guides you through the steps to flash Micropython to the M5Stamp
C3U board.
### Enter Download Mode
To enter the download mode, press and hold the center button (G9) under a
power failure condition. To achieve this, *either* hold the center
button while pressing reset and then release the center button,
*or* disconnect the USB cable and then hold the center button while
connecting the USB cable, and then release the center button.
If successful, the M5Stamp will present a USB CDC ACM device on your host.
### Flash Micropython Firmware
Download the [ESP32-C3 with USB](https://micropython.org/download/esp32c3-usb/)
Micropython port for the M5Stamp C3U.
While the device is in download mode, flash Micropython to the M5Stamp C3U
as follows:
```
esptool.py --chip esp32c3 --port /dev/ttyACM0 --baud 460800 \
write_flash -z 0x0 esp32c3-usb-20221216-unstable-v1.19.1-774-ged58d6e4c.bin
```
Reset the device and you will be able to use the Micropython console via the
USB CDC serial device.
## Examples
### LED and Button
This example changes the LED color each time the center button is pressed.
```python
import machine, neopixel, random, time
button = machine.Pin(9, machine.Pin.IN, machine.Pin.PULL_UP)
led = neopixel.NeoPixel(machine.Pin(2, machine.Pin.OUT), 1)
led.fill((0, 255, 200))
led.write()
while True:
if button.value() == 0:
r = random.randint(0, 255)
g = random.randint(0, 255)
b = random.randint(0, 255)
led.fill((r, g, b))
led.write()
time.sleep_ms(50)
```
### Grove Peripherals
The following example assumes a Grove connector is soldered to the board on
Port A (pins G0/G1/5V/GND). It assumes the following units are all connected
to the same I2C bus via the Grove Hub:
- [CO2 Unit](https://docs.m5stack.com/en/unit/co2):
`SCD40` (co2, temperature and humidity, I2C `0x62`)
- [ENV III Unit](https://docs.m5stack.com/en/unit/envIII):
`SHT30` (temperature and humidity, I2C `0x44`), `QMP6988` (absolute air pressure, I2C `0x70`)
- [DLight Unit](https://docs.m5stack.com/en/unit/dlight):
`BH1750FVI` (ambient light, I2C `0x23`)
Earlier versions of this project used a cheaper eCO2 sensor, but it is no
longer in use:
- [TVOC/eCO2 Unit](https://docs.m5stack.com/en/unit/tvoc):
`SGP30` (indoor air quality, I2C `0x58`)
```python
import machine
import uasyncio
import bh1750fvi
import sht30
import scd40
import qmp6988
i2c = machine.I2C(0, sda=machine.Pin(1), scl=machine.Pin(0), freq=400000)
async def main():
dlx = bh1750fvi.BH1750FVI(i2c)
rht = sht30.SHT30(i2c)
scd = scd40.SCD40(i2c)
prt = qmp6988.QMP6988(i2c)
print("Initializing sensors...")
await scd.start()
while True:
light = dlx.measure()
print("Ambient Light: {}lx".format(light))
temp, humidity = rht.measure()
print("Temp/Humidity: {}°C/{}%".format(temp, humidity))
temp, pressure = prt.measure()
print("Temp/Pressure: {}°C/{}Pa".format(temp, pressure))
scd.set_ambient_pressure(pressure)
co2, temp, humidity = scd.measure()
print("CO2/Temp/Humidity: {}ppm/{}°C/{}%".format(co2, temp, humidity))
await uasyncio.sleep(1)
uasyncio.run(main())
```
*Note:* To install the required Micropython drivers using
[`mpremote`](https://pypi.org/project/mpremote/), copy the `lib/` folder to your
device as follows:
```console
$ mpremote a0 cp -r lib :
```
## Requirements
- `lib/homeassist` requires polling support on SSL sockets when `use_ssl=True`
([micropython/micropython#9871](https://github.com/micropython/micropython/pull/9871))
## Contributing
Contributions are welcome! Please read and follow the
[Code of Conduct](CODE_OF_CONDUCT.md) and make sure to acknowledge the
[Developer Certificate of Origin](https://developercertificate.org/) when
contributing.