The readings are the same. I only experienced the flashing LED problem when I plug in the power jack but not the arduino.

I plugged in the wires & power in that order and experienced the same issues. I also tried using a different Arduino, with the same results. Definitely not ruling out the possibility that my power source is the issue. Still using a 12V 2A power source - but the plugs I found were all the wrong s...

I purchased a 12V 2A power supply and tried to plug it into the lambda shield. When the USB is plugged into the arduino, this process goes fine and the LEDs on both boards light up. If I try to plug in the power supply when the USB is not connected, the LEDs on both boards flash about once/second, b...

Can the board handle 2A? If so, I'll try a higher current power supply.

UA_Optimal (λ = 1.00): 304 (λ = 1.00) UR_Optimal: 176 I'm concerned that the power source could be part of the problem. I'm using a 12V, 1A wall plug. However, it takes multiple tries of plugging the jack into the board, and removing and replacing the jumper wire before the LEDs on both the Arduino ...

1. Using the code linked, this is the serial output: Measuring, CJ125: 0x28FF, UA_ADC: 1010, UR_ADC: 179, UBat_ADC: 732, Lambda: -, Oxygen: 20.95% Measuring, CJ125: 0x28FF, UA_ADC: 1011, UR_ADC: 178, UBat_ADC: 735, Lambda: -, Oxygen: 20.95% Measuring, CJ125: 0x28FF, UA_ADC: 1011, UR_ADC: 179, UBat_A...

The O2 sensor is in normal, open air, not obstructed, etc. It was purchased from this website along with the lambda board. https://lh3.googleusercontent.com/fKTnvJFfE5ABK_AsZlR8UKSJabK5EOx9jKPEtwj11S8gqbPfHBqtlZS7eVKI62A7WTP3Bb0M0b2KtoJYtNhdx-ao8JgTm6B7CBBm9W_Uzn3Bv9VhLhPaxiif5nJeFJpcjJ0pboaQovmtPmW...

The problem also occurs regardless of which port the 12v supply is plugged into - I've tried to plug into each the Arduino and the lambda shield (one at a time!), and the output looks the same.

I've added the jumper wire. The readings have not changed - the GUI outputs 20.95%, and the serial monitor output looks similar to before: STATUS,2,10495,1010,178,733
Still not getting useful readings.

When you say "Never connect more than one power source at any time when using this feature", does that mean that I should not plug in the 12V power source to the board and a USB to the Arduino/computer at the same time?

If so, how can I use the GUI while the sensor is powered?