Low-Frequency 8-Channel 420mA Current Loop HAT for Raspberry Pi

The iQLF4A20M8C is a low-frequency, 8-channel ADC HAT designed for interfacing 420mA industrial sensors with the Raspberry Pi. Built around two ADS1115 16-bit ADCs and integrated precision 250 sense resistors, it converts industry-standard current loops into accurate voltage readings (15V), fully accessible over I²C.

Each ADS1115 is factory-mapped to a dedicated I²C address, enabling simple and scalable multi-channel data acquisition. The HAT is optimized for low-frequency applications such as industrial monitoring, SCADA integration, and environmental sensing, where reliability and precision are critical.

Key Features:

• 8 Analog Input Channels for 420mA current loop sensors
• Converts 420mA to 15V via onboard 250 precision resistors
• Powered by 2 × ADS1115 (16-bit, low-noise ADCs)
  • IC1 @ 0x49: AIN03 Channels 14
  • IC2 @ 0x48: AIN03 Channels 58
• I²C Communication Plug-and-play with Raspberry Pi
• Low-frequency optimized (ideal <100 Hz)
• Sturdy screw terminal blocks for sensor wiring
• Compatible with Python and open-source libraries

Ideal For:

• Industrial 420mA Sensor Integration
• IoT and SCADA Systems
• PLC to Raspberry Pi Interface
• Process Control and Monitoring
• Remote Environmental Sensing
• Engineering Training Kits