# Circuit of Melexis 90640 breakout **URL:** \ **Category:** Support\ **Created:** [March 11, 2026, 12:05pm UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767 "2026-03-11T12:05:09Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![John\_G](https://avatars.discourse-cdn.com/v4/letter/j/c5a1d2/32.png) [@John\_G](https://forums.pimoroni.com/u/John_G)\ **Post date:** [March 11, 2026, 12:05pm UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/1 "2026-03-11T12:05:09Z")
I have a 90640 breakout that I have successfully set up with a display on a Pi Pico. ( The image is disappointing due to what I think is electrical interference. Having worked on similar devices in a previous life, I am not too surprised. To help me hunt down the problem, can you publish the circuit on the breakout board? ---
**Author:** ![John\_G](https://avatars.discourse-cdn.com/v4/letter/j/c5a1d2/32.png) [@John\_G](https://forums.pimoroni.com/u/John_G)\ **Post date:** [March 11, 2026, 12:09pm UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/2 "2026-03-11T12:09:14Z")
Oops lost the link in brackets. The basis of the camera is on Git Hub - weinand/thermal-imaging-camera. ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [March 11, 2026, 12:55pm UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/3 "2026-03-11T12:55:24Z")
This one? [MLX90640 Thermal Camera Breakout](https://shop.pimoroni.com/products/mlx90640-thermal-camera-breakout?variant=12536948654163) [michael-sulyak/micropython-mlx90640: This repository contains a MicroPython driver for the MLX90640 thermal camera sensor.](https://github.com/michael-sulyak/micropython-mlx90640) ---
**Author:** ![John\_G](https://avatars.discourse-cdn.com/v4/letter/j/c5a1d2/32.png) [@John\_G](https://forums.pimoroni.com/u/John_G)\ **Post date:** [March 12, 2026, 10:09am UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/4 "2026-03-12T10:09:14Z")
Yes, that it the breakout I have. I want to see how the actual sensor is connected to the pads on the edge of the PCB. Melixis specify capacitors to remove interference from the 3.3/5.0 V rail. There may also be a switch-mode PSU on the breakout board which could be a source of interference. This type of sensor is dealing with tiny signals from the pixel and they deserve a clean electrical environment :-) ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [March 12, 2026, 11:06am UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/5 "2026-03-12T11:06:54Z")
How long is the cable going from the breakout to the Pi? It might be interference on the i2c bus / cable? You can contact Pimoroni Tech support directly via e-mail. [Submit a ticket : Pimoroni](https://pimoroni.freshdesk.com/support/tickets/new) ---
**Author:** ![John\_G](https://avatars.discourse-cdn.com/v4/letter/j/c5a1d2/32.png) [@John\_G](https://forums.pimoroni.com/u/John_G)\ **Post date:** [March 18, 2026, 8:20pm UTC](https://forums.pimoroni.com/t/circuit-of-melexis-90640-breakout/28767/6 "2026-03-18T20:20:26Z")
Probably a bit long, but I wanted to go to stripboard with very short leads and capacitor bypass on the power rails. That is why I hoped to see the breakout board circuit first. My thoughts are that there may be a switch-mode PSU on the board to handle the 5V/3.3V supply change (the bare sensor is 3.3V only but the breakout is 5V/3.3V. If I don’t see the circuit soon, i will just dive in and report back here.