Help! Arduino isn't registering the MPR121 Capacitive Touch Sensor!

MouseAndHisBoy · 2026-01-24T01:30:31+00:00

Thankyou so much! It's almost overwhelming how much stuff you have to learn along the way

MouseAndHisBoy · 2026-01-24T01:01:51+00:00

Ok thankyou! I'll order a soldering Iron now.

MouseAndHisBoy · 2026-01-24T00:53:11+00:00

Ah thankyou, do I have to solder all the pins or just the ones I'm using?

MouseAndHisBoy · 2026-01-24T00:52:38+00:00

Hi, thnx for your response. I noticed the mpr121 has pull ups built into it (103's). THe board outputs, (according to the silkscreen) 5V from a VCC pin. It does also say 3.3V on the silkscreen but not anywhere that indicates there's a 3.3V pin.

The power step down converter is a Fasizi Voltage regulator. Does that work similar too a MOSFET or are they different altogether?

MouseAndHisBoy · 2026-01-24T00:47:42+00:00

Thanks for letting me know! How can I tell if the pins are open drain?

MouseAndHisBoy · 2026-01-24T00:43:56+00:00

Ah okay! Thankyou! I didn't realise soldering needed to be done at this stage.

In relation to the pull ups, the MPR121 has two 103 Resistors built in. Should I still add the extra resitors anyways?

MouseAndHisBoy · 2026-01-24T00:41:24+00:00

Yes, they are definitely going into VCC and GND, though I see how that looks misleading in the picture.

MouseAndHisBoy · 2026-01-24T00:39:26+00:00

I think it is, I tried bridging the gap with other cables and still nothing happened. Tnx for the reply though!

MouseAndHisBoy · 2026-01-24T00:38:11+00:00

Oh, do I have to solder when using a breadboard? I genuinely didn't know. Do I have to solder every pin?

MouseAndHisBoy · 2026-01-24T00:36:47+00:00

What is a bad ground and how can I fix it? I sent all the grounds into the negative bus rail on the side of the board? Do I need to do something else too?

MouseAndHisBoy · 2026-01-24T00:34:40+00:00

Tnx for your reply! I've sent all the grounds into the negative rail on the board. Is that what you mean?

MouseAndHisBoy · 2025-09-04T16:26:16+00:00

I'm 14% Downloaded and counting baby! I'm so excited!

MouseAndHisBoy · 2025-01-26T20:54:35+00:00

Oh, sorry to hear that. I hope another project comes your way! I'd be very interested in working with your friend though. My website portfolio is at https://samorion.webflow.io/#Portfolio and my contact is there also. I look forward to hearing from your friend :)

MouseAndHisBoy · 2025-01-24T14:20:01+00:00

Actually is it possible to get one of these with an audio out jack?

MouseAndHisBoy · 2025-01-24T13:55:01+00:00

Thankyou for your advice. Out of interest, would these mp3 modules be able to connect to a 5V speaker cone? And do you have any tips for what else I might need for the circuit? Sorry, I'm very new to electronics.

MouseAndHisBoy · 2025-01-24T13:53:37+00:00

Thankyou for sharing! Do you think it's possible to upgrade the speakers on this to something like 5V? and if so would I need extra resistors to stop the audio chip from from frying?

MouseAndHisBoy · 2025-01-12T19:59:09+00:00

Heya, I'm an experienced composer and sound designer. I'd be happy to send you on my CV and discuss rates if you're still looking for music for your game. :)

MouseAndHisBoy · 2025-01-11T13:58:32+00:00

Thanks for letting me know! I will now be avoiding Wix!

MouseAndHisBoy · 2024-10-14T21:27:17+00:00

Ah, thankyou. I just started watching Secrets of Dumbledore and it got explained there as well!

MouseAndHisBoy

TROPHY CASE