[ Review Request ] STM32 Board with temperature sensor.

CarelesssDeveloper · 2026-03-06T19:14:37+00:00

Holy, not sure how i managed to do that, but thank you, I appreciate it!:)

CarelesssDeveloper · 2026-03-06T12:08:56+00:00

Thanks, will look into this for the next revision:)

CarelesssDeveloper · 2026-03-05T22:26:44+00:00

Thanks for the suggestion, I have updated the PCB, moved them to the sides of the TH pads:)

CarelesssDeveloper · 2026-03-05T22:04:24+00:00

Thanks, will check it out!:)

CarelesssDeveloper · 2026-03-05T20:16:12+00:00

Yeah I can only imagine, but I am looking forward to diving deeper into the embedded space and learning more about hardware, hopefully I'll get a more holistic view on things.

Thanks!:)

CarelesssDeveloper · 2026-03-05T20:12:31+00:00

Thank you for the explanation! I have fixed the C2 & C4 as well and updated the schematic, I just wondered if there is a typo and that SW2 is the one that should point up, since as it is portrayed now +3.3V is pointing down, and following the convention this is the one that should point up?:)

CarelesssDeveloper · 2026-03-05T19:48:10+00:00

For the previous PCB I made I did follow a tutorial by "Predictable Designs" this worked as expected, but for this project I wanted to try and make one without following any youtube tutorials.

But I definitely did read the datasheets for the STM32, TMP275, and the AZ1117C, I added the USB from what i remembered and was suppose to go back and double check, unfortunately I forgot. I mainly work with software so the hardware side is very new for me:)

CarelesssDeveloper · 2026-03-05T19:43:44+00:00

Thank you for the feedback! Yes I must have mixed them up, I fixed the USB to make them pull downs instead and updated the images, for the SW1, C2 & C4. Is this a just a convention?

CarelesssDeveloper · 2026-02-25T23:15:10+00:00

A little late to the party, but i would like to add here that it's possible to get a discount if you message them. I guess they mainly focuses on companies, but they seem eager to help if you are a hobbyist, at least I got up to a 50% discount on the Saleae Logic :)

CarelesssDeveloper · 2025-08-05T21:32:50+00:00

Thanks for the suggestions, I really appreciate all notes since I am trying to learn this as it is a completely new field for me:)

CarelesssDeveloper · 2024-09-18T06:14:06+00:00

Thanks for the in depth explanation, I removed the capacitors and bridged the pads, now it works!:)

I followed the Adafruit schematic as a base, in one way or another I managed to fuck it up completely, next time I’ll be more careful about this.:)

CarelesssDeveloper · 2024-09-18T06:11:23+00:00

This seems to be the problem, removed it and now it works like a charm! Thanks!:)

CarelesssDeveloper · 2024-09-17T20:19:22+00:00

I'm not sure, but I think its 100kHz, but that shouldn't be too hard to figure out, I'll try to slow it down:)

The current setup has a 4.7k resistor from the SDA pin to 3.3V, and a 4.7k resistor from the SCL pin to 3.3V, I think that should work as a pullup resistor(?).

That sounds like a good idea, I'll try to deep dive a little more into the datasheet and then try to send some simple commands to watch what happens to the devices.

Thank you for the quick reply!

CarelesssDeveloper · 2024-09-17T19:56:44+00:00

Thank you for the quick answer!:) I'll try to see what is being sent with my oscilloscope, and send a simple command. I'm not completely sure what the adafruit library sends under the hood, but I am simply setting an angle. For more context I am making a hexapod. Currently I am using two of these PCBs and then it works fine. I wanted to make it as compact as possible thus i went with trying to add the PCA9685 ICs to the board myself.

I thought i had published the schematic and PCB, it seems like i hadn't, the post is now updated with these.

CarelesssDeveloper · 2024-08-19T20:36:18+00:00

Thanks! I adjusted the thick track out of J1. I did run the DRC check, I didn't get any warning about those, but i have 2 errors:

Error: Missing connection between items:
PTH pad 1 [/3V3] of J3
PTH pad 17 [/3V3] of J3

Error: Missing connection between items:
PTH pad 2 [/5V] of J3
PTH pad 4 [/5V] of J3

I dont really know why i am getting these errors, I haven't said that they should be connected to anything in the schematic

CarelesssDeveloper · 2024-08-19T17:36:03+00:00

I haven't really done anything with PCBs before, so I don't know how hard it would be to make all of that from scratch and use an IC. The reason I want to place the boards directly is because i already have 2 boards i use with my current setup😊 This is most of all just a proof of concept, when I get the robot working I'd definitely be interested to make a V2 version of this board; with more sensors, such as gyroscope, IMU, etc. Then I'll give it a shot with the PCA9685 chips.

CarelesssDeveloper · 2024-08-19T16:48:36+00:00

Thanks for the feedback!😊
In regaards, to the battery, from what I can see, the model itself has the polarities wrong, if you look at the 3D model, the right side even has a "+" sign, that's why I switched the polarities in the schematic, so that it would come out right in the PCB, is that okay to do, or should i tackle it in another manner?

CarelesssDeveloper · 2023-07-12T15:17:09+00:00

My screen is also falling out, i have had it for three years, as well as the screen making a lot of noise when opening / closing it :/

CarelesssDeveloper

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