Unanswered Questions
890 questions with no upvoted or accepted answers
4
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Nema 17 Stepper Motor Weak Torque (A4988, Arduino)
I'm attempting to run a Nema 17 stepper motor using the common A4988 stepper motor driver. I'm running the motor with a Teensy 4.0, an Arduino-based microcontroller.
The main issue I'm running into is ...
- 587
4
votes
0
answers
237
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Review of electric circuit with Arduino
I am currently working on a project for which I am in charge of the electronic circuit. Since I have never worked with electronics before, I am really desperate and unsure whether what I am doing is ...
Null♦
- 7,871
3
votes
0
answers
209
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IDT7132 Dual Port SRAM PCB not working as expected
I have designed a RAM PCB for a very basic 8-bit CPU project that uses an IDT 7132 2k x 8 dual port SRAM.
The datasheet for the IDT7132 is here: https://www.renesas.com/en/document/dst/713242-...
- 1,615
3
votes
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answers
143
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How does online code editing work in a PLC?
Some PLCs, such as Allen Bradley CompactLogix, allow "online" changes to be made to the running program on the PLC. These changes are (almost) instantly applied and don't require the PLC to ...
- 9,361
3
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0
answers
107
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DAC not recognized by I2C and creates strange side-effect
Let me preface by saying that I am new here, and I can't seem to solve this problem for the life of me.
Problem: I am using the LTC2655BIGN-H16 DAC and attempting to interface with it via I2C with an ...
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3
votes
0
answers
142
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Minimum circuitry for robust operation of the "new" ATtinys (1614) with Optiboot
I have spent hours now trying to catch up on the replacements for the old ATtiny's, there does not seem to be a robust (meaning, with protections that we could find in an UNO or Mega for example) ...
- 9,361
3
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0
answers
172
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Running a 12V motor on 9V battery and arduino and matlab implementation
I have a DC geared motor rated at 12V and 60 rpm . It has a quadrature encoder with 700 PPR. I connected it directly to a 9V battery (almost new) and wished to measure the rpm of that motor. To find ...
- 71
3
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0
answers
209
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Nokia display stopped working
I had plenty of Nokia displays so I decided to use them with microcontrollers.
I found pinout instructions from here, connected one of the 3310 LCDs with my ESP32 because it runs on 3V3, and used ...
- 528
3
votes
0
answers
363
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MCU, N-channel MOSFET, ~15m led strip, 24V power supply. Whats happening?
Disclaimer
Hi,
Firstly, I'd like to underline, that I do not have masters degree from electrical engineering and I didn't study electrical engineering on high school. I'm software engineer who likes ...
- 131
3
votes
0
answers
485
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I2C connection randomly dies with error 4
I am trying to interface an ESP8266 microcontroller with an ICM-20948 IMU chip.
Using the reference code from Invensense, the internet and trial and error, I managed to configure the chip do do 9-axis ...
- 241
3
votes
0
answers
173
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Arduino Every Nano with 3.7V Li-Po - Reading voltage
I have Arduino Every Nano and 3.7V Li-Po battery (Akyga LP903759). I want to read the current voltage of a battery using analog pin. If I use a 50 kOhm and 200 kOhm resistor (in voltage divider) I'll ...
- 31
3
votes
0
answers
270
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Replacing an ammeter with voltmeter?
I have found this circuit of a millivoltmeter, and it seems like something which as a hobbyist I can do it, and the range of the measurement is very suiting one of my projects, but I would like to ...
- 75.1k
3
votes
0
answers
538
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Transimpedance AMP, Active HPF, phototransistor
So this is the part where I would like the phototransistor (TEMT6000X01) to be able to clearly capture an LED with a frequency flashing on and off at 1kHz. So what I have here is a transimpedance ...
- 135
3
votes
0
answers
115
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one sided touch sensor?
I am trying to create a glove that translates sign language into text. To do this i need touch sensors placed on the glove, however the only sensors that i can find detect a change in electromagnetic ...
3
votes
0
answers
997
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PWM to synth control voltage improvements
Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
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