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https://github.com/pi4j/pi4j-example-devices
Device support project for the TCA9548 (1x8 I2C switch)
https://github.com/pi4j/pi4j-example-devices
Last synced: about 1 month ago
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Device support project for the TCA9548 (1x8 I2C switch)
- Host: GitHub
- URL: https://github.com/pi4j/pi4j-example-devices
- Owner: Pi4J
- Created: 2020-09-14T20:35:01.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-11-10T17:16:06.000Z (about 1 month ago)
- Last Synced: 2024-11-10T18:24:27.732Z (about 1 month ago)
- Language: Java
- Homepage:
- Size: 58 MB
- Stars: 10
- Watchers: 8
- Forks: 7
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
Pi4J :: Java I/O Library for Raspberry Pi :: Devices
====================================================
Collection of devices implemented for use with Pi4J V2.
Project by Tom Aarts.
```text
Note: This repository has a tag identifying the code level that works with
2.4.0-SNAPSHOT. Commits newer than this tag are migrations to the
2.6.0-SNAPSHOT. These commits may contain code using providers and/or Pi4J-V2
interfaces not available in prior SNAPSHOTs..
```
The following lists the currently supported devices within this project:
* [1602A LCD HD44780U](src/main/java/com/pi4j/devices/hd44780u_lcd1602a/README.md): App uses SN74HC595 to control the LCD
* [1602A LCD MCP23017 I2C Controller](src/main/java/com/pi4j/devices/mcp23017_lcd1602a/README.md): App uses MCP23017 to control the LCD
* [1602A_LCD_PCF8574A I2C Controller](src/main/java/com/pi4j/devices/pcf8574a_lcd1602a/README.md): App uses PCF8574A to control the LCD
* [ADS1256 24bit A-to-D](src/main/java/com/pi4j/devices/ads1256/README.md) (1)
* [AT24C512 SEEPROM](src/main/java/com/pi4j/devices/at24c512/README.md) (1) (2)
* [BMP280 Temperature and Pressure Sensor](src/main/java/com/pi4j/devices/bmp280/README.md) (1)
* [BME280 Temperature, Pressure and Humidity Sensor (I2C & SPI)](src/main/java/com/pi4j/devices/bme280/README.md) (1)(3)
* [DAC8552 16bit DAC SPI connected](src/main/java/com/pi4j/devices/dac8552/README.md) (3)
* [DHT22 Temp/Humidity sensor](src/main/java/com/pi4j/devices/dht22/README.md) (1)
* [HC-SR04 Ultrasonic Sensor](src/main/java/com/pi4j/devices/hcsr04/README.md)
* [Is31fl3731 matrix controller](src/main/java/com/pi4j/devices/is31Fl37Matrix/README.md) (1)
* [MCP23008 drive and read chip GPIOs](src/main/java/com/pi4j/devices/mcp23008/README.md)
* [MCP23008 and MCP23017 Pin monitoring (interrupt support)](src/main/java/com/pi4j/devices/mcp23xxxApplication/README.md)
* [MCP23017 drive and read chip GPIOs](src/main/java/com/pi4j/devices/mcp23017/README.md)
* [MCP3008 A/D 10bit converter](src/main/java/com/pi4j/devices/mcp3008/README.md) (1)(3)
* [MCP4725 12 bit DAC](src/main/java/com/pi4j/devices/mcp4725/README.md) (1)
* [MPL3115A2 Temp/Pressure/Altitude device](src/main/java/com/pi4j/devices/mpl3115a2/README.md) (1)
* [NeoPixel94V Intelligent Control LED device](src/main/java/com/pi4j/devices/neopixel94v/README.md) (1)(3)
* [QT Rotary Encoder](src/main/java/com/pi4j/devices/rotary_encoder/README.md) (1)
* [SN74HC595 8 Bit shift register](src/main/java/com/pi4j/devices/sn74hc595/README.md) (1)
* [SSD1306 OLED I2C](src/main/java/com/pi4j/devices/ssd1306/README.md) (1)
* [TCA9548 (1x8 I2C switch)](src/main/java/com/pi4j/devices/tca9548/README.md)
* [VL53L0X TimeOfFlight device](src/main/java/com/pi4j/devices/vl53L0X/README.md) (1)
### Notes:
(1): This package uses code within this repo and Pi4J \
(2): Requires 2.2.2-SNAPSHOT of Pi4j that supports i2c multibyte write/restart \
(3): SPI versions of the device uses Pigpio, cannot be used on Raspberry Pi5 \
### GPIO monitor
This repository includes two Python scripts to monitor GPIO pin states in real-time on a Raspberry Pi. \
**Note**: These scripts use the pigpio library, which is currently incompatible with the Raspberry Pi 5.
**Setting Up pigpio**
To install pigpio, run:
```bash
pip install pigpio
```
Also, make sure the `pigpiod` daemon is running before executing either script:
```bash
sudo pigpiod
```
1. `monitor.py`
This script provides a detailed, line-by-line log of GPIO state changes, including the time difference in microseconds between state changes for each pin.
- Usage:
```bash
python3 monitor.py # Monitor all GPIO pins
python3 monitor.py 23 24 25 # Monitor only GPIO pins 23, 24, and 25
```
- Features:
- Logs state changes (`HIGH`/`LOW`) for each monitored GPIO pin.
- Displays the time difference between successive state changes in microseconds.
- Structured with modular functions for initializing GPIO monitoring, handling state changes, and cleanup on exit.
- Example Output:
```bash
Monitoring GPIO pins... Press Ctrl+C to stop.
GPIO=23 Level=1 Time Diff=120 μs
GPIO=24 Level=0 Time Diff=95 μs
GPIO=25 Level=1 Time Diff=110 μs
```
2. `monitor_table_format.py`
This script offers a compact, tabular format for monitoring GPIO states, displaying the current state of each pin in a single, updating line. This view is ideal for visualizing slow state changes without excessive log clutter.
- Usage:
```bash
python3 monitor_table_format.py # Monitor all GPIO pins
python3 monitor_table_format.py 23 24 25 # Monitor only GPIO pins 23, 24, and 25
```
- Features:
- Displays pin states in a single, continuously updating line.
- Ideal for slow changes, as it reduces visual clutter by showing only the current state of each pin.
- Automatically updates the state every second (customizable by adjusting the sleep interval).
- Example Output:
```bash
Monitoring GPIO pins... Press Ctrl+C to stop.
GPIO 23 | 24 | 25
STATE 1 | 0 | 1
```