MLX90614 and Nano Every

Using Arduino Sensors
1

Hello there

I want to build a hotplate / reflow oven controller based on Arduino Nano Every and MLX90614 temperature Sensors.

Why MLX90614? Because i can put it into my main PCB and measure without having to deal with hystersis between the mesured point of material and actual temperature, when using for example a thermocouple.

I walready built a crude version of this, the Arduino measures the Temperature of a 300W hotplate via Thermocouple and SPI interface and drives a TRIAC which just switches on and off the 230VAC. Problem is the plate is getting hot so fast, i cannot really control it this way, so i added the hardware for PWM.

My biggest problem now is that i cannot get the MLX90614 to work reliably, it gives me so many values spreaded from -50°C to 700°C at temperatures like 200°C. My sensor is located about 80mm from the measured object.

Does anyone have some experience with this types of sensors?

2

You are saying the that the sensor worked well before you began to attempt to control the heater control with PWM?

You should read the forum guide so that you know what to include in your post to enable forum members to help you.

Right now my guess is that your attempt to control the heater with PWM is not working (maybe you don't understand how Triacs work) and also causing interference which is affecting the sensor.

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