How to set PWM frequency to 1 Hz on an UNO - Arduino Forum
Nov 29, 2018 · I would like to set a pwm output on my UNO to run at a 1 Hz frequency and then, by analogWrite, set it at 10% or 90% dutycycle. Can that be done? If so, how do I do it? The …
ds3231 SQW enable 1hz practicing - Arduino Forum
Sep 24, 2018 · Hello, i am learning how to use I2C, speccially with ds3231 for starting, there are a lot of libraries to make ds3231 work but i want to learn from scratch, i´ve been readiing some pdf files and …
Blinking at 1HZ - Programming - Arduino Forum
Nov 30, 2019 · Hi, I have to do this task for an assignment. Write a program that turns on an LED attached to Pin3 for 5 seconds then turns it off. The light should stay off for 3 seconds and then the …
Connecting DS3231 RTC SQW pin to Uno R3 - Arduino Forum
Dec 20, 2024 · I want to use a DS3231 real time clock module to send 1Hz pulses into an Arduino Uno R3 digital interrupt pin 2. The RTC module is a no-name brand. It says HW-084 on the PC board, but …
ESP32 - What is the minimum PWM frequency? - Arduino Forum
Aug 21, 2020 · The esp32-hal-ledc.h file has the following prototype: double ledcSetup (uint8_t channel, double freq, uint8_t resolution_bits); You could try and just set the frequency to 0.5. e.g. double …
What is a 1 Hz blink? - Programming - Arduino Forum
Oct 6, 2025 · what even is a 1hz blink? A blink cycle that repeats exactly once per second. Hz = repeats per second. The blink cycle you created repeats once every two seconds, so 0.5Hz as mentioned …
Timestamps with Milliseconds Using DS3231 - Arduino Forum
Nov 23, 2020 · If the SQW is set to 1Hz, then once you have the lastISR saved, to get the number of milliseconds on top of the seconds when you record an incident you need to do millis () - lastISR (ie, …
DS3231 RTC Board Without a Battery - Arduino Forum
Aug 4, 2023 · Is it OK to use a DS3231 board without a battery? I am a newbie just starting out with Arduino, and need accurate fairly long term timing for my Nano stepper motor project. I don't need …
ESP32: Schematic to blink LED during deep sleep
Apr 18, 2024 · My goal is to have a circuit that allows me to disable the LED, enable the LED at 100% and to blink that LED. This should all be possible to happen while the ESP is sleeping. As far as I …
Opta PWM limitations - Opta - Arduino Forum
Mar 12, 2025 · PWM 1 and 4 work fine down to ~1Hz. This behaviour was tested/could be recreated with standard PWM example code in IDE. Has anyone observed such behaviour? is it a hardware …