INA219 Thermoelectric Generator

[alphacat92]

Hello Leo,
Apologies, I've attached them here. Simply put, I connected the positive side of the TEM (thermoelectric module) to Vin+ on the INA219 and the negative side to GND. I also connected Vin- to GND. Using the default getcurrent code (shown below), I get readings of 0 for the bus voltage, load voltage and power. The shunt voltage and current readings do register (less than 100 mV and mA) when I put my hand on the TEM (and therefore induce a delta T between the two plates of the TEM), so that tells me it at least works in some fashion. The values don't seem to match the behavior I got I hooked up the TEMs to a multimeter and tested it a while back.
I'm testing this with a Laird HT8-12 TEM and the datasheet is here.

Code:

#include <Wire.h>
#include <Adafruit_INA219.h>

Adafruit_INA219 ina219;


void setup(void)
{
  Serial.begin(115200);
  while (!Serial) {
    // will pause Zero, Leonardo, etc until serial console opens
    delay(1);
  }

  uint32_t currentFrequency;

  Serial.println("Hello!");

  // Initialize the INA219.
  // By default the initialization will use the largest range (32V, 2A).  However
  // you can call a setCalibration function to change this range (see comments).
  ina219.begin();
  // To use a slightly lower 32V, 1A range (higher precision on amps):
  //ina219.setCalibration_32V_1A();
  // Or to use a lower 16V, 400mA range (higher precision on volts and amps):
  ina219.setCalibration_16V_400mA();

  Serial.println("Measuring voltage and current with INA219 ...");
}

void loop(void)
{
  float shuntvoltage = 0;
  float busvoltage = 0;
  float loadvoltage = 0;
  float power_mW = 0;
  float current_mA = 0;

  shuntvoltage = ina219.getShuntVoltage_mV();
  busvoltage = ina219.getBusVoltage_V();
  power_mW = ina219.getPower_mW();
  loadvoltage = busvoltage + (shuntvoltage / 1000);
  current_mA = ina219.getCurrent_mA();

Serial.print("Bus Voltage V: "); 
Serial.print(busvoltage);
//Serial.println(" V");
  Serial.print("\t");
  
Serial.print("Shunt Voltage mV: "); 
Serial.print(shuntvoltage); 
//Serial.println(" mV");
  Serial.print("\t");
  
Serial.print("Power mW: "); 
Serial.print(power_mW); 
//Serial.println(" mW");
  Serial.print("\t");
  
Serial.print("Load Voltage V: "); 
Serial.print(loadvoltage); 
//Serial.print(" V"); 
  Serial.print("\t");
  
Serial.print("Current mA: "); 
Serial.print(current_mA); 
//Serial.print(" mA");
  Serial.print("\t");
  
  Serial.println("");

  delay(50);
}