/r/breadboard

Photograph via snooOG

This is a place to learn and to show off electronics prototyping. All levels of expertise are welcome from the beginner to the enthusiast to the professional.

/r/breadboard is an electronics and electrical engineering lounge. It is a place to ask for and offer advice or helpful hints on electronic schematics, breadboard layouts, printed circuit board designs, or to show off your prototyping efforts. Tutorials and schematic guides are also encouraged.

All skill levels are welcome. Please post homework questions to a more appropriate sub.

Posts that are off topic will be removed.

/r/breadboard

8,929 Subscribers

2

How do I make the two LED blink?

New to this and these are what I'm using

NPN Transistor 2 piecies

Resistor Value 470 0.25 watts 2 pieces Resistor Value 10k 0.25 watts 2 pieces Capacitor 10 UF 16 3 pieces

Obviously I have wires for jumper and a battery to light it up

0 Comments
2025/02/02
07:09 UTC

35

Apprentice work

I’ve recently made a 7segment display on a bread board for a presentation for my apprenticeship course and will soon have a traffic light circuit (decade counter) on bread board too. Please give me advise or any tips for the future :D

8 Comments
2025/01/31
15:15 UTC

3

Breadboard moisture sensor

Hello breadboarders,

I am preparing for a school project, and I wanted some advice. I want to make a circuit that uses a soil moisture sensor to detect moisture content in the soil, and then do some other stuff. However, I only want the analog data (so like if the moisture is high, it outputs a low resistance or something. I am not familiar with how they work exactly). Most of these sensors that I could find come with microchips attached to them that have comparators and potentiometers and such on them, but I don't need that. I have found a few sensors where the actual prongs are detached from the microchips (although they still come with them) and was wondering if I could just use the sensor without the chip. Any clarification would be helpful. Thanks!

https://preview.redd.it/1x5hdn3ny5ge1.png?width=1000&format=png&auto=webp&s=6ac855b993e30c60fb0be3ba719b4e48b809fb87

3 Comments
2025/01/30
17:11 UTC

1

Breadboard power supply (but without breadboard)

hi guys, a newbie to building electronics here, so apologies if this is a simple/dumb question.

I am building a roller blind opener (the one where you pull on a string) with a stepper motor and IR receiver module. I managed to get the circuit and code working but now I want to move from my desk to my window to test it out.

Currently I'm using a power supply module from elegoo directly on the bread board and have 5V and GND connected for the ULN2003 stepper motor driver module connected to the breadboards +/- and the GND wire for the IR module connected to the breadboards -.

https://preview.redd.it/rzfwz7fz2zde1.png?width=658&format=png&auto=webp&s=4a888629047a3fd0ad900d55b20fa9a962d905b3

I was wondering if its possible to bypass the breadboard completely and put the pins directly on the power supply modules 5v and GND?

3 Comments
2025/01/19
15:55 UTC

9

Traffic Lights using 555 IC

Why does the yellow LED doesn't work after the green LED? It only switches from green to red.

Resistors used (left to right) 100k, 47k, 1k, 1k, 330R

Here's the yt tutorial that i followed tho: https://www.youtube.com/watch?v=UCvafxvFgoc

2 Comments
2025/01/14
06:25 UTC

7

Traffic Lights using 555 IC

Why does the yellow LED doesn't work after the green LED? It only switches from green to red.

Resistors used (left to right) 100k, 47k, 1k, 1k, 330R

Here's the yt tutorial that i followed tho: https://www.youtube.com/watch?v=UCvafxvFgoc

3 Comments
2025/01/14
06:24 UTC

2

Please help

I’m in need of help to make the digits 0-3 with a switch. I need to use and AND OR and NOT. Please show me how to do this I’m a beginner

1 Comment
2025/01/13
20:44 UTC

5

I only copied this from a youtube tutorial, but it sees that after the yellow LED turns on it switches back to green LED instead of the red LED. Resistors used from left to right (based on the video attached) 100K, 47K, 1K, 330

1 Comment
2025/01/13
15:34 UTC

3

New to breadboarding. How do I measure the current in a series circuit?

1 Comment
2025/01/12
10:06 UTC

4

Software Engineer; want to learn Electronics for funsies

Hey all, I'm a full time SWE by trade (Android development) and I really want to get into electronics in my free time as a neat hobby

But i have to say... it's a daunting hobby

There is so much to learn, and so many different disciplines that contribute to the craft

I'm honestly not sure where to start. Should i start with some Arduino courses? Should i start with Raspberry PI? Should i start WITHOUT microcontrollers at all? Should i start by learning the basics of electrical engineering? Should i start with learning hardware? I just don't know!

If any of you wizards out there could point me in the right direction, I'd be eternally grateful

My goal is to just be able to do fun little projects for my personal life, some for nonsensical reasons, some for useful purposes, maybe even some IoT stuff, who knows

4 Comments
2025/01/12
02:50 UTC

5

IoT Temp and Humidity

0 Comments
2025/01/11
04:19 UTC

0

hello guys, i have an exam tom. Can u guys help me with these circuits. Cananyone use breadboard simulators to send these. Thanks

6 Comments
2025/01/07
14:41 UTC

10

100 LED Chaser Circuit Using IC555 and CD4017

1 Comment
2025/01/05
07:38 UTC

2

just got a big kit, need ideas of how to store stuff

i need ideas of how to store my stuff and keep it organized, because i am already finding that it all becomes messy (i have done like 12 different things today) i was thinking a big pill container or 3d printing something but i wanted to ask you guys for the best solutions. p.s is there a way to keep the rods on my resistors nice and strait because when i push them into the breadboard they tend to bend and it annoys me.

4 Comments
2025/01/05
06:00 UTC

2

Wiring problem on breadboard, tinkercad issue?

Hi, i built a 7 segments display using the NOT, AND and OR logic gates. On tinkercad everything works fine, the count from 0 to 9 is nicely done.

I replicated the same pattern from tinkercad into the breadboard just to notice pair numbers work fine, 0, 2, 6 and 8. The rest (1, 3, 4, 5, 7) doesnt work at all. Im sure i copied the same stuff from tinkercad, i already did it 5 times, and all times is wrong.

This is the tinkercad link:
https://www.tinkercad.com/things/9qrZl5456Hz-ejercicio-7segmentos-klb

and a photo of my breadboard, the one doestn work, but 2 does.

https://preview.redd.it/ov0k5mn7yvae1.jpg?width=1080&format=pjpg&auto=webp&s=87eea5951f97926bfc8ff4c691ac56a828076a36

https://preview.redd.it/21k46mn7yvae1.jpg?width=2048&format=pjpg&auto=webp&s=76008088ef3de5fb72247e53af886a062fac9b2d

0 Comments
2025/01/04
02:09 UTC

1

Any good store for breadboard stuff in berlin?

Does anyone of you know a good store in berlin for breadboards and breadboard equipment? My son got a breadboard starter set of amazon and now i want to buy some stuff with him in a local store to fill some gaps in the set.

Thanks for your help

1 Comment
2024/12/29
21:08 UTC

16

What to do next? 74HC161

555 timer, 74HC161 counter, i want to control a 7 segment display with an 8 bit counter, but i have not had the time to experiment with it, Zero is 4 on signals on a 7 segment, and 1 is 2 so is there a type of decoder in crumb i can use to accomplish the correct bytes? The only other option i know of is making my own out of transistors

5 Comments
2024/12/29
19:47 UTC

2

Controlling a 16x2 lcd screen by hand with out microcontrollers

So I want to control a lcd screen with out a microcontroller, what is the best way to do so? I tryed to follow an example by Mitch Davis on YouTube, but it wouldn't do any thing, the screen model is 1602a

1 Comment
2024/12/28
04:54 UTC

0

Precut red and black power/ground jumpers?

Why does nobody sell a box of pre-cut, pre-stripped red and black power and ground jumper wires in the obvious short lengths?
Would save soooo many hours.

4 Comments
2024/12/27
15:52 UTC

8

74HC02 D flip flop

2 Comments
2024/12/27
06:33 UTC

7

Fast finger game/ buzzer quiz game not working on breadboard

I'm using a 555 timer IC, and it's not working. Am I doing something wrong, or do you have any suggestions to help it function?

2 Comments
2024/12/24
05:11 UTC

4

Think it will transfer to the solderable breadboard well?

2 Comments
2024/12/23
02:29 UTC

3

Seeking Rechargeable Breadboard Power Supply Module Adjustable By Hand

MEGO looks nice but I find it disconcerting you have to adjust the trimpot with a screwdriver. Anybody know of one with a control knob & a digital readout?

0 Comments
2024/12/22
03:12 UTC

Back To Top