A technique for drastically reducing the pins required by a matrix keypad is described.
Project tutorial by Giovanni Carrera
A voltage to frequency converter can realize an opto-isolated analog input for Arduino or other microcontroller systems.
A simple and inexpensive solution is to use a 'mobile power bank'
by Giovanni Carrera
This interesting project will cover all things required for the ultimate goal of building a mobile remote surveillance camera.
Project tutorial by danionescu
The robot navigates indoor, in a pre-defined path, with high accuracy, and allows its real-time tracking on a phone. No GPS, No WiFi, No Map
Project tutorial by Team oblu
A tiny telegraph that can write any text messages that look like a telegrammes. This project made of oak plywood.
Project showcase by Yegor_A
Hi, 800 mV are too many, with that type of operational amplifier the zero can be of some tens of mV. Have you tried to adjust the Rp trimmer? Read also the answers I gave to the previous questions. With the addition of a negative power supply the zero problem is eliminated.
To measure the curves of semiconductors I would recommend my project "A bipolar analog I / O for Arduino Due" found in my blog ardupiclab.blogspot.com.
a noise of about 300 mVpp is unacceptable. The causes could be multiple and I don't have enough information for a diagnosis. Try to measure voltages in various points and power supplies. Avoid long wires and check grounding. An oscilloscope would be very useful.
You will find more details and also other examples of keypads in my blog: ardupiclab.blogspot.com
Or connect with your social account:
New here? Create an account