Difference between revisions of "Interface the HX711 to Pi"

Revision as of 03:04, 24 April 2014

WARNING! This is under development and not ready for production!

Two DCT Electronic HX711 boards with metal shield.

DCT Electronic HX711 board plugged into P5

Building a Raspberry based electronic scale using the DCT Electronic HX711 board is as easy as Pi!

The DCT board comes with two sets of male headers, straight and right angle, and a metal shield.

Order the board for $6.99 on Ebay
This one for $2.19 should work, too.
Download the software from gitHub
git clone https://github.com/ggurov/hx711
Solder a 1x4 straight female header in P5 on Pi (bottom side of board) and a 1x4 male header on the DCT board
Solder the load cells to the DCT board.
Plug the DTC board into the Pi.
Change the GPIO pins in hx711.c from 30 and 31 to 28 and 30. This way they are all on one side of P5:

#define CLOCK_PIN       30
#define DATA_PIN        28

Temperature drift using the HX711 and CZL635

@@ Line 1: / Line 1: @@
+'''WARNING! This is under development and not ready for production!'''
 [[File:Hx711b.jpg|thumb|right|600px|Two DCT Electronic HX711 boards with metal shield.]]
 [[File:Hx711a.jpg|thumb|right|600px|DCT Electronic HX711 board plugged into P5]]
@@ Line 46: / Line 48: @@
 ==HX711 Spec Sheets==
 http://hivetool.org/w/images/d/d2/Hx711_english.pdf
-==Load Cell Spec Sheet==
+==Load Cells==
+===Spec Sheets===
 #[http://www.phidgets.com/products.php?category=34&product_id=3135_0 CZL635 Spec Sheet (from Phidgets.com)]
 #[[Media:CZL602X.pdf|CZL602X Spec Sheet]]
+===Theory and Application Notes===
+#[[Media:Load_cell_primer.pdf|LOAD CELL TECHNOLOGY IN PRACTICE by REVERE TRANSDUCERS APPLICATION NOTE 07/6-13/01]]