Pages: [1]   Go Down
Author Topic: Voltage Output from Arduino with Multiplexer.  (Read 1502 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 4
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi, I was wondering if there was a way to use a 16 channel multiplexer to read voltage readings? If so, how would you go about it? Thanks.
Logged

Offline Offline
Faraday Member
**
Karma: 30
Posts: 2528
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

With a voltage divider?
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 549
Posts: 27425
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

You want the Arduino to be able to read 16 voltages from 0 to 5V?
A multiplexer with 16 inputs, 4 select lines, 1 output going into an analog input pin could do that.
http://www.digikey.com/product-detail/en/74HC4067N,652/568-7817-5-ND/1230423
http://www.digikey.com/product-detail/en/DG406DJZ/DG406DJZ-ND/821393
I don't know if the switch resistance will impact the signals you want to measure.

Parts with lower switch resistance are available, will need more control lines to select a channel tho
http://www.digikey.com/product-detail/en/ISL8499IVZ/ISL8499IVZ-ND/1034830
and they're all surface mount. All the thruhole parts are in the 80-100+ ohm range.

Or two 8-channel ADC chips with SPI interface
http://www.digikey.com/product-detail/en/MCP3208-CI%2FP/MCP3208-CI%2FP-ND/305928
12-bit data for better resolution, and also a faster conversion rate than the '328P internal ADC - 100K vs 9-10K.
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Pages: [1]   Go Up
Jump to: