arduino - Proper usage of PC817 Optocoupler - Electrical …
Jan 4, 2020 · This 3.7 VDC is fed to the input of optocoupler PC817 pin 1 and 2. On the output, I wanted to read the high and low through an Arduino connected to pin 3 and 4 of the optocoupler.
Operation of PC817 - Electrical Engineering Stack Exchange
Everything is analog if you look closely (until you look closely enough that quantum mechanics rears its head). Perhaps your friend is comparing the photo transistor-output PC817 to the type …
How to get 3.3 output voltage in PC817 opto coupler?
Jul 17, 2015 · I am using PC817 opto coupler. I want a 3.3 V output. In its 1st pin I am giving 12 V and 2nd pin is gnd. I have connected a pulldown resistor on 3rd pin, but I am confused …
How to find a fast optocoupler (or how to read the datasheet)
May 20, 2022 · Looking at a typical PC817 datasheet I see the following response times rise (4-18µs) fall (3-18µs) and a cut-off frequency of 80kHz. Does that mean a PC817 can be used up …
Isolated digital input to microcontroller using optocoupler
Oct 12, 2022 · I am using an optocoupler (PC817) to provide isolation between sensor pulse output and microcontroller digital input (GPIO pin). The sensor voltage is rated = 5vdc-24vdc …
Esp32 controls a 12v coil relay through PC817 and 2N7000
Jul 12, 2024 · Current to PC817 IR LED will be about (3.3-1.0)/1k8=1.28mA. In worst case current transfer ration of PC817 can be as low as 50% and therefore collector current can theoreticaly …
Controlling a 5 V input with a 3.3 V ESP8266 via an opto-isolator
Jan 30, 2023 · I want to control a 5 V input on another device with a ESP8266 by using a PC817 opto-isolator. I am using the following wiring: The output pin is connected to an Arduino-like …
Circuit for 12V relay with an optocoupler using 3V3 GPIO
Feb 4, 2022 · I am trying to design a circuit to control a G6S-2 12V relay that powers on/off a 12V device using a GPIO from an ESP32-WROVER and one PC817 optocoupler. This is the circuit …
How should trigger the 5V relay with an ESP8266? Using PC817 or ...
Jan 29, 2020 · I attached both schematics. In schematic 1, the relay is triggered using PC817 optocoupler. In schematic 2, the relay is triggered using MMBT3906 NPN transistor directly. …
ESP32 opto-isolated relay board not working - PC817 opto …
Oct 2, 2022 · ESP32 opto-isolated relay board not working - PC817 opto-isolator, 2N3904 NPN BJT and SRD-05VDC-SL-C relay Ask Question Asked 3 years, 2 months ago Modified 11 …