TG on Solar Chimneys: Viable Energy Solution Or A Lot Of Hot Air?.ytrewq on Reverse-Engineering The ESP32’s WiFi Binary Blob With A Faraday Cage.Foldi-One on UEVR Project Converts Games To VR, Whether They Like It Or Not.Hackaday Podcast Episode 252: X1Plus Hacks Bambu, Scotto Builds A Katana Keyboard, And Bass Puts Out Fire 2 Comments Posted in hardware, Tech Hacks Tagged current mirror, keypad, matrix, resistive divider Post navigation Do you have any examples of solving problems by looking into old and/or less-common techniques? Let us know in the comments below. Heavy analog electronics, for sure, but something to keep in mind if you’re reading more than 12 keys. And has posted an example of just such a program on his GitHub repository for an Arduino. Dropping the voltage divider and measuring the current through a current mirror generates a linear voltage across its output load resistor that can be easily read by your microprocessor. But that means using the voltage divider equation, and the difference in voltage between keys can get very small. Normally you’d throw in some resistors to form different voltage dividers depending on which key is pressed, and read the resulting voltage off of a voltage divider with an ADC. He learned that sometimes what’s hard to do in the voltage domain is easy in the current domain. looked into the past to come up with a better way, specifically a 646 page, 1 kg textbook from 1990 - Analogue Ic Design: The Current-Mode Approach by Toumazou, Lidgey, and Haigh. If you have just four or five discrete buttons, it isn’t terribly difficult, but if you have a 12- or 16-keypad matrix, things get complicated. The usual method involves building a resistive ladder that gives unique and equally spaced voltages for each keypress. From the channel explains how to simplify your resistive divider keypad design on Hackaday.io.
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