All Questions
22 questions
5
votes
3
answers
741
views
74LS161 miscounting
Following Ben Eater's 8-bit computer assembly, my program counter, which is built out of 74LS161s, does not count correctly. In trying to figure out the issue, I have completely isolated the circuit ...
- 51
2
votes
3
answers
88
views
Using alkaline C cells to drive a pair of solenoids
I am working on a walking robot for my class in mechanical engineering. I have two 12 VDC solenoids that need to be actuated. Their resistance is 4 ohm so basically will require 6 amps @ 12V for the ...
- 21
1
vote
1
answer
124
views
Custom i2c with Arduino UNO
For educational purposes, I would like to write my own i2c protocol. Is it possible to write a custom i2c library to communicate using regular ports, or should I use the SCL and SDA ports? Can I mimic ...
0
votes
1
answer
161
views
DIY Quadrature Encoder? [closed]
Really struggling with making encoders work in my leonardo board, i could probably go the 20 ppr encoder way but i need it to be optical and not electrical/mechanical.
I was thinking about using 2 IR ...
- 9
0
votes
2
answers
153
views
What is the cause of Arduino glitching in this DIY soldering station?
I was following this (Spanish/Spanglish warning) tutorial to create a DIY soldering station. I created the schematic, PCB and ordered the parts to assembly, used a cheapo 5 V and 24 V AC-DC power ...
- 5
1
vote
0
answers
76
views
18650 capacity tester opamp voltages on inputs different
I assembled an 18650 Li-Ion capacity tester with an Arduino Pro Mini.
Here is the schematic:
When I set the discharging current to 100 mA in the code (which means there has to be 100mV on pin 3 of ...
- 21
0
votes
2
answers
144
views
Relay with AT89S52 microcontroller
I'm working on a project where I'm using 8051 microcontroller as a primary microcontroller which is interfacing with 4 relays. I have tested relays with two of my arduinos but when it comes to AT89S52 ...
2
votes
3
answers
466
views
Can we connect multiple devices to the mains with just 1 cable?
The project: An Arduino DIY Relay-controlled aquarium with a water pump, a heater, and a light bulb. All 3 have the exact same wires according to the EU standards: 1 "hot" brown wire and a ...
- 411
0
votes
1
answer
579
views
What type of wire can I use to run 5V, 30A to my Arduino controlled relay module over a distance of 10-12m?
I'm building an Arduino-controlled Christmas light show. I power my 16-channel relay module with a 5V, 30A supply. It is placed outside the house and I want to place its power supply powering the ...
- 3
1
vote
2
answers
580
views
APA102 LED strips behaving weirdly and flickering towards the end
I am trying to make a 29 x 29 LED matrix to display animations using the APA102 (Dotstar) LEDs with an Arduino MKR Vidor 4000 as a microcontroller. I have connected the data and clock signals of the ...
- 11
1
vote
0
answers
53
views
What programmable board should I use for my project? [closed]
I have a small project going on, you can call this a research project that I needed to pass a certain class。 But the thing is, I don't know what I should use Arduino? Raspberry Pi? Im a complete ...
- 155
0
votes
1
answer
120
views
Components for smartwatch [closed]
I am relatively new to the smartwatch manufacturing process and I am not hardware engineer. I have seen few videos on DIY smartwatch. Following is what I have learned so far:
We need to manufacture ...
- 101
0
votes
0
answers
223
views
Repetitive Problems With DIY Arduino EEG
I'm a hobbyist with only minor electronics experience trying to construct an EEG machine as part of a basic brain-computer interface. I'm following this tutorial for a DIY EEG using an arduino, but I'...
- 1
0
votes
3
answers
116
views
Even though the signal gets low several times a second why our eyes are only able to see the bulb glowing all the time
I was learning Pulse Width Modulation and it told me that it just the technique to change the amount of time the signal gets high in one wave, but why am I able to see the bulb glowing at all the time ...
0
votes
1
answer
106
views
FR 5311M Programmable servo? [closed]
I bought this odd servo motor called the FR 5311M from FeeTech, which is advertised as a programmable servo motor which can switch from position to continuous rotation by flashing it with FeeTech's FR ...
3
votes
3
answers
1k
views
What are an amateur's options to put a high-end IC on a board? [closed]
I'm actually an experimental physicist who does software-development for a living. So my knowledge basically stops at writing micro-controller programs and putting them on a breadboard, and hooking ...
0
votes
1
answer
3k
views
DIY ultrasonic sensor with LM358
I would like to make an ultrasonic sensor. For reciever part I have found this scheme: (source: www.kerrywong.com/2011/01/22/a-sensitive-diy-ultrasonic-range-sensor/)
Instead of LPC662 I would use ...
user74857
0
votes
1
answer
597
views
Can my DIY Arduino be powered with 12V battery via lm2576 switching regulator?
I have lm2576 switching regulator circuit with output constant 5v/3A. Can I use it with a 12V battery and connect it to power my Arduino?
- 11
-6
votes
1
answer
109
views
Explanation of Circuit? [closed]
Circuit for Time Controlled Switch
Can anyone please explain how this circuit is working? It is basically a time controlled switch? I want to know what is the functioning of each component i.e, ...
-2
votes
2
answers
156
views
How to gather data about how weight is distributed by feet on a plane over time? [closed]
I have seen a graphical representation of a person's bare feet and how their body mass is distributed across their feet bottoms by color coding the pressure at each coordinate and over time showing ...
- 99
0
votes
1
answer
2k
views
How to hack my Nespresso Lattisima [closed]
This morning I woke up wanting to drink a cup of coffee and, as usual, it annoys me that I have to turn on the machine only to wait a minute before I can begin brewing.
I want to be able to turn on ...
- 131
0
votes
1
answer
888
views
Which battery should I use to power arduino+motor shield + two motors
I am using two motors ( from old two drill machines - same kind, these are 3.6v motors ), connected to arduino + arduino motor shield seeed studio v2.
I tried to use 18v/1.2a battery that was laying ...
- 101