ADS1115 REST API, CLI & Web Panel for Raspberry Pi

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• 🤖 LLM usage: $0.7500 (5 commits)
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Generated on 2026-05-06 using openrouter/qwen/qwen3-coder-next

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Complete solution for controlling the ADS1115 16-bit ADC on Raspberry Pi using adafruit-circuitpython-ads1x15 library.

Features:

• 🌐 Web Panel - Modern web interface with live data, I2C scanner, and configuration
• 🔌 REST API - FastAPI-based HTTP API for programmatic access
• 💻 CLI Shell - Interactive command-line interface with logging
• 🔍 I2C Detection - Automatic I2C bus scanning and device detection
• 🐳 Docker Support - Run in containers with mock/real hardware modes
• ⚙️ Configuration - YAML, .env, and environment variable support

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🚀 Quick Start

Option 1: Raspberry Pi Native (Recommended for hardware)

# Copy files to RPi, then:
sudo ./install_rpi.sh

# Access web panel
http://raspberrypi.local:8080

Option 2: Docker with Mock Data (Testing/Development)

# Start web panel
docker-compose up web

# Access at http://localhost:8080

Option 3: Native Python

pip install -r requirements.txt
python web_panel.py  # Web panel with I2C scanner
python api.py        # REST API only
python cli.py --help # CLI commands

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📁 File Structure

.
├── api.py              # FastAPI REST API
├── web_panel.py        # Web panel with I2C scanner
├── cli.py              # Click CLI application
├── ads1115_service.py  # Service layer
├── config.py           # Configuration management
├── run.py              # Launcher script
├── install_rpi.sh      # RPi auto-installer
├── RPI_INSTALL.md      # Detailed RPi installation guide
├── requirements.txt    # Python dependencies
├── Dockerfile          # Docker image
├── docker-compose.yml  # Docker Compose (uses .env)
├── .env                # Environment configuration
├── .env.example        # Environment template
├── config.yaml         # YAML configuration
└── README.md           # This file

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🌐 Web Panel

Features

• I2C Scanner - Detect all devices on I2C bus
• ADC Readings - Read all 4 channels with voltage
• Live Mode - Continuous streaming
• Configuration - Change I2C address, gain, data rate
• Status Monitor - Hardware connection status

Web Panel Endpoints

Endpoint	Method	Description
/	GET	Web panel interface
/api/health	GET	Service health
/api/i2c/scan	GET	Scan I2C bus
/api/config	GET/POST	Configuration
/api/read/all	GET	Read all 4 channels
/api/read/{channel}	GET	Read single channel
/ws	WebSocket	Live streaming

Access at: http://raspberrypi.local:8080

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🔌 REST API

Endpoints

Endpoint	Method	Description
/health	GET	Health status
/config	GET/POST	Configuration
/read/{channel}	GET	Read channel (0-3)
/read/all	GET	Read all channels

Example Requests

# Scan I2C bus
curl http://localhost:8080/api/i2c/scan

# Read all channels
curl http://localhost:8080/api/read/all

# Update configuration
curl -X POST -H "Content-Type: application/json" \
  -d '{"gain": 2, "data_rate": 250}' \
  http://localhost:8080/api/config

API Documentation

Interactive docs available when running:

• Swagger UI: http://localhost:8080/docs
• ReDoc: http://localhost:8080/redoc

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💻 CLI Usage

Commands

# Device status
python cli.py status

# Read single channel
python cli.py read 0
python cli.py read 0 --continuous

# Read all channels
python cli.py readall
python cli.py readall --continuous --count 10

# Log to file
python cli.py log --output data.csv --interval 1

# Update config
python cli.py config --gain 2 --data-rate 250

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🔧 Configuration

.env File (Recommended)

# I2C Settings
ADS1115_I2C_ADDRESS=0x48
ADS1115_GAIN=1.0
ADS1115_DATA_RATE=128
ADS1115_MODE=single
ADS1115_MOCK=false      # 'true' for testing

# API Settings
API_HOST=0.0.0.0
API_PORT=8080

# RPi Network
RPI_IP=192.168.188.212

Environment Variables

Variable	Description	Default
ADS1115_I2C_ADDRESS	I2C address	0x48
ADS1115_GAIN	ADC gain	1.0
ADS1115_DATA_RATE	Samples per second	128
ADS1115_MOCK	Mock mode	false
API_HOST	Bind address	0.0.0.0
API_PORT	Port	8080

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🐳 Docker Usage

Using docker-compose

# Start web panel
docker-compose up web

# Start API
docker-compose up api

# Run CLI command
docker-compose run cli python cli.py status

Manual Docker

# Build image
docker build -t ads1115 .

# Run with mock data
docker run -p 8080:8080 -e ADS1115_MOCK=true ads1115 python web_panel.py

# Run on RPi with hardware
docker run -p 8080:8080 --device /dev/i2c-1 ads1115 python web_panel.py

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🍓 Raspberry Pi Installation

Automated Installation

# Copy to RPi
scp -r ./* pi@raspberrypi.local:~/ads1115/

# SSH to RPi and install
ssh pi@raspberrypi.local
cd ~/ads1115
sudo ./install_rpi.sh

Hardware Wiring

ADS1115          Raspberry Pi
--------         ------------
VDD       ->     3.3V (Pin 1)
GND       ->     GND (Pin 6)
SCL       ->     SCL (Pin 5)
SDA       ->     SDA (Pin 3)
ADDR      ->     GND (address 0x48)

Service Management

# Check status
sudo systemctl status ads1115-web

# Control service
sudo systemctl start ads1115-web
sudo systemctl stop ads1115-web
sudo systemctl restart ads1115-web

# View logs
sudo journalctl -u ads1115-web -f

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📊 API Response Format

I2C Scan Result

{
  "bus": 1,
  "devices": [
    {"address": "0x48", "description": "ADS1115", "detected": true}
  ],
  "ads1115_detected": true,
  "ads1115_address": "0x48"
}

Channel Readings

{
  "channels": [
    {"channel": 0, "raw_value": 8452, "voltage": 1.0565, "gain": 1.0},
    {"channel": 1, "raw_value": 9234, "voltage": 1.1543, "gain": 1.0},
    {"channel": 2, "raw_value": 7500, "voltage": 0.9375, "gain": 1.0},
    {"channel": 3, "raw_value": 6200, "voltage": 0.7750, "gain": 1.0}
  ],
  "mock_mode": false,
  "i2c_address": "0x48"
}

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📐 Hardware Specifications

• Chip: ADS1115 16-bit ADC
• Interface: I2C (addresses: 0x48, 0x49, 0x4A, 0x4B)
• Channels: 4 single-ended or 2 differential
• Data Rate: 8 - 860 SPS
• Gain: 2/3, 1, 2, 4, 8, 16

I2C Addresses

ADDR Pin	Address
GND	0x48
VDD	0x49
SDA	0x4A
SCL	0x4B

Gain Settings

Gain	Voltage Range
2/3	±6.144V
1	±4.096V
2	±2.048V
4	±1.024V
8	±0.512V
16	±0.256V

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🛠️ Troubleshooting

I2C Permission Denied

sudo usermod -a -G i2c pi
newgrp i2c

Enable I2C Manually

sudo raspi-config
# Interface Options -> I2C -> Enable

# Or edit config
sudo nano /boot/firmware/config.txt
# Add: dtparam=i2c_arm=on

sudo reboot

Check Logs

# Native installation
sudo journalctl -u ads1115-web -f

# Docker
docker-compose logs -f web

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📚 Links

• This README
• RPI_INSTALL.md - Detailed RPi installation
• API docs: http://localhost:8080/docs
• Web panel: http://localhost:8080

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Made for Raspberry Pi with ❤️

License

Licensed under Apache-2.0.

Author

Tom Sapletta