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Soldered Electrochemical NH3 Gas Sensor Breakout (Qwiic)

This board measures ammonia (NH3) from 0 to 300 ppm with an SGX-4NH3 electrochemical cell. An LMP91000 analog front end biases the cell and turns its current into a voltage, a 16-bit ADS1115 ADC converts it, and an ATtiny404 talks to both chips for you, so your microcontroller sees a single I2C device on its Qwiic cable.

Purple Soldered gas sensor breakout seen at an angle, with the round gas cell underneath, two Qwiic connectors, the ADDRESS switch and labelled header pads
The breakout with the NH3 cell fitted underneath
Top view of the breakout: ADDRESS switch and JP5 at the left, Qwiic connectors on both sides, header pads labelled along the top, bottom and right edges
Top side: Qwiic connectors, ADDRESS switch and header pads
Underside of the breakout with the round gas cell in the middle, a list of gas names printed on both sides and labelled header pads
Underside with the gas cell

This documentation is for​

Purple Soldered gas sensor breakout seen at an angle, with the round gas cell underneath, two Qwiic connectors, the ADDRESS switch and labelled header padsProductSoldered Electrochemical NH3 Gas Sensor Breakout (Qwiic)Ammonia sensor board with an SGX-4NH3 cell for 0 to 300 ppm, read over Qwiic.SKU 333330ShopBuy it on our shopPrice, stock and every variant of this product in the Soldered shop.https://soldered.com/products/soldered-electrochemical-nh3-gas-sensor-breakout-qwiicOpen the shop page

At a glance​

InterfaceI2C over Qwiic, address 0x30 (0x30 to 0x37 by switch)
Main ICLMP91000 analog front end, ADS1115 16-bit ADC, ATtiny404 bridge
GasAmmonia (NH3), SGX-4NH3 electrochemical cell
Range0 to 300 ppm, 2 ppm resolution (electronics dependent)
Voltage3.3 V only, no regulator
Connectors2x Qwiic, 2.54 mm headers
Dimensions38 x 38 mm
EnvironmentsArduino, MicroPython

What's in the box​

QtyItemNotes
1Soldered Electrochemical NH3 Gas Sensor Breakout (Qwiic) (main product)SKU 333330
1Header pinsNot soldered to the board