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SGP40 air quality sensor with ESP32
Today I will show you how to write code and test the SGP40 air quality sensor with ESP32 and Arduino code. It needs a companion SHT21
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Human eye light level sensor BH1750
Let’s study the human eye light level sensor BH1750, a sensor capable of sensing between 1 and 65535 Lux via i2c
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Binary clock with ESP32 and API
I am showing you how to implement a binary clock with ESP32 and API, getting hour and minute from the internet and showing in LEDs
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Capacitive touch and debounce with Renesas RA4M1
I am showing you how to implement a capacitive touch and debounce with Renesas RA4M1 and TTP223b touch controller, using Arduino code
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DIY RGB light box with Arduino
Let’s get to making a RGB light box with Arduino, using WS2812b neopixels and Arduino Pro mini, battery powered
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Blinking commemorative keychain
Let me show you how I made a blinking commemorative keychain, made of PCB and a simple oscillator circuit (3 components)
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Currency converter display with ESP32
The idea is to create a currency converter display with ESP32, showing live conversion data in a OLED display with ESP32 and Arduino code
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MQTT protocol with ESP32 and Adafruit.io
Today I am implementing and testing the MQTT protocol with ESP32 and Adafruit.io, an effective way of sending data to the internet
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APDS9900 cellphone presence sensor
Let’s learn how to use the APDS9900 cellphone presence sensor, a light and presence sensor by Broadcom for cellphones
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Electronic dice with Raspberry Pi Pico 2
I’m implementing a full electronic dice with Raspberry Pi Pico 2, using the random() function of the Arduino IDE and LEDs
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Using a LDR light level sensor
Let’s get using a LDR light level sensor to sense the amount of light in the environment around. I am using a Raspberry Pi Pico 2
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HTU21D temperature sensor with ESP32
We are going to implement code for using the HTU21D temperature sensor with ESP32. This is an i2c temperature and humidity sensor.
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LM35 temperature sensor with ESP32
Let’s dive in and learn how to use the LM35 temperature sensor with ESP32, using a single analog input and a bit of simple code.
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Ultrasonic distance sensor HC-SR04 with ESP32
Today we are going to talk about the ultrasonic distance sensor HC-SR04 with ESP32, a neat little sensor used to measure distances
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Analog input readings with ESP32
You can have analog input readings with ESP32, the code is simple and requires a single configuration, “analogReadResolution”. Let’s code!
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GY-50 L3G4200D gyroscope with ESP32
We will learn how to use the GY-50 L3G4200D gyroscope with ESP32, a component made by ST semiconductor to measure angular velocity
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Project: time and temperature e-paper display
Today we are buiding a time and temperature e-paper display, based on a NTC thermistor and the DS1307 RTC chip, displaying on e-paper
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2.9″ E-paper display from WeAct
Let’s learn how to use the 2.9″ E-paper display from WeAct, an epaper display with which you can do a lot of cool stuff
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Getting started with Raspberry Pi Pico 2
This article is about getting started with Raspberry Pi Pico 2, the new foundation’s silicon and circuit board
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Minimalist USB thermometer with ESP32 – update 1
This is an update on the “minimalist USB thermometer with ESP32” project of mine. I have decided on the sensor and sent the pcb for fab