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Results tagged with raspberry-pi
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user 187471
The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. There have been several generations of the device with improved performance, more memory, and more connectivity. This tag should be used for electrical engineering questions that involve the use of a Raspberry Pi. For questions about the Raspberry Pi itself see the Raspberry Pi specific forum (raspberrypi.stackexchange.com).
1
vote
THM3060 RFID reader setup issues
Question
How to set up the THM3060 RFID reader?
The OP's RFID module wiring is show below.
Answer
Contents
Part A - Schematic
Part B - User Manual Reading Notes
Part C - Pi My Life Up Library Testin …
- 2,956
5
votes
ULN2803 not working like I expect, or at all
Ah, ULN2803 is a 8-channel (low side switching) sink driver, for common anode LEDs.
For common cathode LEDs, you need the complement/mirror: UDN2981 (high side switching) 8-channel source drivers.
The …
- 2,956
33
votes
Accepted
How to properly use a relay module with JD-VCC from Arduino/Raspberry?
Question
The OP has a 4 channel relay module similar to one shown below. The module has a yellow jumper at the bottom right, marked JD-Vcc. What is it and how to use it?
Acknowledgement and Updat …
- 2,956
4
votes
Accepted
SPI slave randomly missing bits in response
Question
The OP is testing MCP3008 with SPI speed 1.35MHz, and found results inaccurate. How come?
Answer
Update 2020aug17hkt2136
MCP3008 and MCP3208 Programming Notes
Now that all basic MCP3201 func …
- 2,956
1
vote
How to switch ON a Raspberry Pi, Arduino, ESP32, etc from SQW pin of RTC DS3231
Question
How to use a 3V logic signal to switch on/off a P-Channel power MOSFET which in turn switches on/off a 5V power supply for Arduino, Rpi, or ESP32?
Answer
(1) I must first point that you don' …
- 2,956
0
votes
How to wire this relay with a H/L (High/Low) jumper to Raspberry Pi?
Answer
(1) The OP's relay has a H/L jumper to select the relay to be High trigger or Low trigger.
(2) If the H/L jumper is set to "H", then the relay becomes High level trigger. If jumper set to Low, …
- 2,956
1
vote
MCP 4725 with raspberry pi
Yes, you can use MCP4725 with rpi.
Yes, IF you power your MCP4725 with 5V0.
The devices addresses are 0x62/0x63 for A0 = 0/1
The on board pull up resistors are 4k7. You need to remove them IF you ha …
- 2,956
5
votes
How to protect GPIO from back current? Diode?
Question
The OP is learning how to use Rpi to control a 12V DC motor using a 5V relay without any optical isolation. To adjust motor speed and direction, He uses a PWM controller and a DPDT reverse p …
- 2,956
3
votes
Driving 5V powered relay module from 3V3 powered microcontroller
Question
The OP has a Low level triggered SSR for 5V Arduino.
The OP found that the 3V3 Raspberry Pi Zero (and 3V3 Arduino Mini Pro etc) can turn it on, but cannot turn it off (with only the status LE …
- 2,956
-2
votes
Why can't I trigger my relay?
Question
How come my relays C and D do not turn on?
Answer
Introduction
I read your design and found everything looking good. I will later look at the datasheets you referred and see if there are o …
- 2,956
7
votes
Do the MCP23S17 GPIO pins need protection against latch up ESD within this circuit?
Question
How come my MCP23S17 GPIO extender gets very hot and goes crazy?
/ to continue, ...
Answer
Part 1 - Test setup
I would suggest to start with a smaller version of the user requirements. For …
- 2,956