I’m trying to use this ADC
https://www.sparkfun.com/products/15334
to read digital values from this force sensitive resistor
https://www.sparkfun.com/products/9375
What I’m finding is that it is very difficult to see anything between the lowest and highest numbers being read. I am using my finger to adjust pressure upon it on my desk. Here’s example output:
A1:313
A1:323
A1:296
A1:269
A1:281
A1:2047
A1:2047
A1:276
A1:288
A1:285
A1:299
A1:2047
A1:2047
A1:2047
A1:339
A1:335
The lowest values, without any pressure on the sensor, float around 300 and just about any pressure on it at all results in 2047.
This is using the ReadBasic example (but with the pin changed to A1, of course).
https://github.com/sparkfun/SparkFun_AD … dBasic.ino
I have one lead from my resistor attached to the Vcc terminal and the other to the A1 terminal.
Is there some library call I can make to have this return finer grained values or do I need to physically hook it up differently?
Thanks for any help.
You need to add a second resistor to form a voltage divider. See the hookup guide for details.
Oh, that’s much better! Thanks for the quick reply.
20:14:19.259 → Device found. I2C connections are good.
20:14:19.259 → A1:0
20:14:19.593 → A1:0
20:14:20.105 → A1:0
20:14:20.601 → A1:0
20:14:21.090 → A1:0
20:14:21.611 → A1:0
20:14:22.109 → A1:0
20:14:22.603 → A1:0
20:14:23.103 → A1:0
20:14:23.596 → A1:0
20:14:24.118 → A1:2
20:14:24.612 → A1:23
20:14:25.108 → A1:71
20:14:25.596 → A1:100
20:14:26.126 → A1:172
20:14:26.612 → A1:351
20:14:27.098 → A1:545
20:14:27.628 → A1:716
20:14:28.125 → A1:918
20:14:28.627 → A1:1058
20:14:29.119 → A1:1113
20:14:29.608 → A1:1166
20:14:30.113 → A1:1249
20:14:30.635 → A1:1306
20:14:31.125 → A1:1339
20:14:31.613 → A1:1348
20:14:32.112 → A1:1359
20:14:32.606 → A1:1353
20:14:33.130 → A1:1354
20:14:33.613 → A1:1351
20:14:34.133 → A1:1271
20:14:34.635 → A1:0
20:14:35.111 → A1:0
20:14:35.636 → A1:0
20:14:36.130 → A1:0
20:14:36.617 → A1:0
20:14:37.141 → A1:0
20:14:37.641 → A1:0
20:14:38.133 → A1:0
20:14:38.638 → A1:0
20:14:39.123 → A1:6
20:14:39.650 → A1:9
20:14:40.143 → A1:23
20:14:40.629 → A1:46
20:14:41.152 → A1:368
20:14:41.633 → A1:874
20:14:42.157 → A1:1064
20:14:42.655 → A1:1025
20:14:43.138 → A1:1098
20:14:43.642 → A1:1118
20:14:44.148 → A1:1104
20:14:44.645 → A1:1097
20:14:45.149 → A1:1078
20:14:45.654 → A1:1046
20:14:46.150 → A1:39
20:14:46.656 → A1:0
20:14:47.149 → A1:0
20:14:47.639 → A1:0
20:14:48.169 → A1:0
20:14:48.667 → A1:0
