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Hardware Design

Has anyone ever got the CH224K to work correctly?

Has anyone ever got the CH224K to work correctly? For some reason it doesn’t seem to be able to request voltages above 9V. Only 5V and 9V are possible.

How can I correctly measure battery voltage using the A0 pin on Arduino?

I want to know when the batteries of a model are getting low. The 5 AA batteries are over 5 volts so I cannot check the end voltage. I make […]

Why Does My ESP32-WROVER-B Fail to Power On Intermittently?

hey, I’m experiencing intermittent power-on failures on my ESP32-WROVER-B dev board after connecting external peripherals, including a BME280 temperature and humidity sensor, MPU6050 accelerometer and gyroscope, 5V DC motor controlled […]

How to Implement Scrolling Display for MIDI Inputs on Arduino Opta with SSD1306 OLED?

Latest step in a MIDI drums project: Displaying MIDI inputs to an Arduino Opta w/ an SSD1306 OLED and my AUX adapter device https://www.tindie.com/products/35482 Wasn’t too hard to get the […]

How to Reverse the Output of a Reed Switch Circuit to HIGH?

I’m using a circuit that gives a LOW output on D when a magnet passes by the reed switch. Is there a way to make it output HIGH instead? (HIGH […]

How to Design Amplifier and H-Bridge Circuits for an Electromagnetic Flow Meter Project?

Hey everyone, I’m currently working on an electromagnetic flow meter project and have finished the assembly, including the electrodes and Faraday cage. Now, I’m moving on to the circuitry, but […]

Can I Use a Single Pin as Both Rx and Tx on an ATtiny85 for Software Serial?

Related question: I’ll likely use an ATtiny85 for this project, meaning limited IO pins (WIP schematic pictured). I’ll mostly be listening for signals with a software serial Rx pin, but […]

What do you guys usually use as your go-to IoT platform?

What do you guys usually use as your go-to IoT platform? I’ve been working on an Arduino presentation involving their Pro line and just between us… (as much as one […]

Those of you that use a CR2032 battery, have you ever looked at the datasheet?

Those of you that use a CR2032 battery, have you ever looked at the datasheet? Per this one https://www.mouser.com/datasheet/2/315/3627_fileversion-1627278.pdf for instance, using just 2mA drops the capacity significantly in terms […]

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