CdiK4D0Em

MPR121 Touchpad

Overview

Interpolation algorithms can be used to obtain the precise coordinates of a finger on the touchpad. If there are 7 electrodes arranged horizontally, from ELE0 to ELE6, the horizontal coordinates are calculated as follows:
SumN = 1 × Dele(0) + 2 × Dele(1) + 3 × Dele(2) + ... + 7 × Dele(6)
SumD = Dele(0) + Dele(1) + Dele(2) + ... + Dele(6)
Coordinate = SumN ÷ SumD
SumN(n) is the data from the filter register of each electrode in the mpr121, and SumD(n) is the data from the corresponding electrode reference value register.
The vertical coordinates can be calculated using the same method.

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2026-03-28 08:32:39

Questions about IAR FOR AVR allocation in array
In a project, M128 and external 32KRAM are used. There are several global large arrays, two 4000 arrays, and three 1000 arrays (hehe, big enough, right?). When declaring these arrays without locating
Radio beacon-guided drones can detect toxic gases
According to foreign media New Atlas, in environments such as disaster sites, toxic gas leaks can pose a real risk to rescue teams. With this in mind, Spanish researchers have transformed a small dron
[ARM.Cortex-A8 embedded system development and practice]. Ni Xuxiang. Ji Chunlei. Scan version [ED2000.COM]
[b][size=6][color=#ff0000]Baidu network disk download [url=http://pan.baidu.com/share/link?shareid=153474&uk=2351207151]http://pan.baidu.com/share/link?shareid=153474&uk=2351207151[/url][/color][/size
Flash chip detection and burning issues
I use Samsung's f9f208, but I found that many chips have bad sectors. I wonder if these bad sectors affect the use? And how to detect these chips before welding? If there is a programmer with a fixtur
Transforming real-time Linux projects
How to use raw-os with linux to build real-time linux has been considered for 2 years. Several solutions have been considered, but none of them are universal. During this period, a feasible solution i
Embedded system meaning and application
Abstract: This paper questions the currently popular definition of embedded systems in China , arguing that embedded systems are not "dedicated computer systems" and that embedded systems are not just

Datasheet More

Circuits More