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
Perhaps your friend is comparing the photo transistor-output PC817 to the type of opto coupler that has an logic output type IC or a photodiode driving a transistor on the output. For example …
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 …
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 output voltage. In its 1st pin I am giving 12volt and 2nd pin is gnd. I have connected a pull down resistor on 3rd pin. But i am confused …
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 …
Optocoupler Ltspice model - Electrical Engineering Stack Exchange
Jul 15, 2022 · .ends PC817 It looks like the input diode is connected in series with a resistor and voltage across the resistor is fed to a voltage-controlled current source. The source is …
Using Opto-Coupler with STM32 - Electrical Engineering Stack …
I'm using PC817 Opto-Coupler to turn on a relay. My VCC voltage is about 4.2 volts and the MCU is an STM32F4 with 3.3v voltage level. When I set the MCU pin (M_Relay) low, it seems that …
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 …
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, 1 month ago Modified 10 …