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by tlfong01
Wed Feb 13, 2019 5:16 am
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 6684

Re: RPI Zero W multiple sensors

The studio would consist 512 senors (too many types to list here), 32 ADCs (HX711, ADS1510), 64 cameras, 128 LED lamps, ... Soil Moisture Sensing and Watering - Distributing Processing Brainstorming Ideas Now I am brainstorming talking to myself aloud, writing ...
by MMoazam
Mon Feb 11, 2019 4:26 pm
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 6684

Re: RPI Zero W multiple sensors

... can search the forum for my relevant old posts using the keywords "tlfong01" + "hx711" + "mcp23017" + "esp3266" + "lua" etc. Or you can ...
by tlfong01
Mon Feb 11, 2019 2:18 pm
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 6684

Re: RPI Zero W multiple sensors

1. weigh growing pods - load-cell and HX711 (four of each of them) 2. control Humidity and temperature with DHT22 attached ... You can search the forum for my relevant old posts using the keywords "tlfong01" + "hx711" + "mcp23017" + "esp3266" + ...
by tlfong01
Wed Jan 23, 2019 9:13 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

... the discussion of this weight scale topic in the very beginning, I did not expect to write so many posts. But then I found the weight sensor HX711 very interesting, so I did some research, and try to test the device, using ESP8266, MCP23017, and then MCP23S17. I found it hard to test HX711, ...
by tlfong01
Fri Jan 18, 2019 2:40 am
Forum: Automation, sensing and robotics
Topic: Cat Home DIY Q&A - Solenoid How To
Replies: 35
Views: 6331

Re: Cat Feeder DIY - How to use solenoid to control cat food flowing out of box down to bowl

... 011 - How to use solenoid (ZYE1) Cat Home DIY Question 012 - How to use solenoid valve (?) Cat Home DIY Question 021 - How to use weight sensor (HX711) Cat Home DIY Question 031 - How to use WiFi microchip (ESP8266) ...
by tlfong01
Thu Jan 10, 2019 7:28 am
Forum: Automation, sensing and robotics
Topic: Seeking a way to verify food was dispensed
Replies: 6
Views: 833

Re: Seeking a way to verify food was dispensed

... on the best way to confirm food got to the monsters. Thanks! HX711 to monitor cat food Try HX711! RE: HOW TO USE SOLENOID LOCK 12V DC Postby tlfong01 » 2019-Jan-08 Tue 5:24 pm https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=230325&start=25#p1413410 ...
by tlfong01
Tue Jan 08, 2019 9:24 am
Forum: Beginners
Topic: How to use Solenoid Lock 12V DC
Replies: 45
Views: 8015

Re: How to use Solenoid Lock 12V DC

tlfong01 wrote:
Tue Jan 08, 2019 7:13 am

Rpi3B+ + ESP8266-12 + HX711 based auto cat feeder design notes
...
by tlfong01
Fri Dec 28, 2018 7:07 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

tlfong01 wrote:
Fri Dec 28, 2018 7:04 am
Using SPI signals to directly control HX711
Instead of debugging my program, I decided to cheat - use SPI signal directly and forget about ESP8266/MCP230xx/MCP23Sxx altogether!

Programming Notes on HX711 control by 26 SPI pulses at 100kHz

/ to continue, ...
...
by tlfong01
Fri Dec 28, 2018 7:04 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

The only conclusion is that my [MCP23S17/MCP23S08] program is bad! Using SPI signals to directly control HX711 Let me walked through my failures so far (2018nov24 to now). 1. HX711 requires 25, 26, or 27 pulses as input. The specified clock high time is 0.2uS < t-high < 50uS, ...
by tlfong01
Tue Dec 18, 2018 1:51 pm
Forum: Automation, sensing and robotics
Topic: Relay Module KY-019 5V
Replies: 488
Views: 126440

Re: Relay Module KY-019 5V

... precision is set to only two decimal digits, and my cheap meter is only 0.5mV precise. I hope the sensitivity numbers would look good after HX711 24 digit ADC. Calibration Results 3 Rseults in 500g to 10kg range looks OK. Again, the non linearity is due to cheap meter's low resolution of ...
by tlfong01
Tue Dec 18, 2018 9:41 am
Forum: Automation, sensing and robotics
Topic: Relay Module KY-019 5V
Replies: 488
Views: 126440

Re: Relay Module KY-019 5V

... precision is set to only two decimal digits, and my cheap meter is only 0.5mV precise. I hope the sensitivity numbers would look good after HX711 24 digit ADC. (supper time, hungry again, call it a day!) :mrgreen: ...
by tlfong01
Tue Dec 11, 2018 8:58 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

... Rpi3B+ SPI at frequency 1MHz OK Last couple of months I played with Rpi I2C MCP23017 and found Rpi's 100kHz limit is too slow for DHT22 and HX711. Therefore I gave up I2C and MCP23017. This time I am anxious to check if SPI can do 100MHz properly. I used the same program and set frequency ...
by tlfong01
Fri Dec 07, 2018 7:59 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

... use Rpi python, Rpi to control MCP23017 which in turn controls HX711 HX711 programming design notes I read my old post to refresh my memory ... of 10kHz: (HX711 Control Signal Timing) RE: READING OLD WEIGHT SCALE - tlfong01 2018dec01 https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&start=50#p1398970 ...
by tlfong01
Fri Dec 07, 2018 7:26 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

... notes Earlier I wrote a ESP8266 NodeMCU Lua 5.1 blink program but found it not able to blink faster than 1kHz, therefore useless to control HX711 which requires control pulses of period less than (50uS x 2) = 1S/100uS = 1,000,000uS / 100uS = 10,000 = 10kHz. Now I am thinking of forgetting ...
by tlfong01
Tue Dec 04, 2018 6:32 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

MCP23017 Troubleshooting notes - setting up another RPi I found the HX711 program has intermittent failures, with the remote error message "Remote IO errors". I think there are many causes, including the following: 1. Rpi power supply not stable. ...
by tlfong01
Sun Dec 02, 2018 6:28 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

HX711 Rate Select Notes OpenScale Applications and Hookup Guide https://learn.sparkfun.com/tutorials/openscale-applications-and-hookup-guide/hardware-features Power Cycling When the report rate is above 500ms OpenScale will ...
by tlfong01
Sat Dec 01, 2018 9:52 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

HX711 Test Cheater Cable HX711 during operation, input channels A and B read the output from the Wheatstone bridge. However, for testing, an adjustable voltage reference 0mV ~ 7.5mV, pretending to be a Wheatstone bridge output, ...
by tlfong01
Sat Dec 01, 2018 8:29 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

And I am disconnecting ESP8266 wires from HX711. HX711 Test Cheater Cable HX711 during operation, input channels A and B read the output from the Wheatstone bridge. However, for testing, an adjustable voltage reference 0mV ~ 7.5mV, pretending ...
by tlfong01
Sat Dec 01, 2018 5:47 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

tlfong01 wrote:
Sat Dec 01, 2018 4:27 am
Which load cell to test, 500g, 1kg, or 5kg?

HX711 ESP8266 decoupling/rewiring notes

And I am disconnecting ESP8266 wires from HX711.
by tlfong01
Sat Dec 01, 2018 4:27 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 11 So the 5kg load cell full bridge is tested OK. Next step is to test the HX711 amplifier. Which load cell to test, 500g, 1kg, or 5kg? So I am going to write ...
by tlfong01
Sat Dec 01, 2018 3:21 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

Controlling HX711 using Rpi3B+, MCP23017, and python3 Using MCP23017 to read 12 HX711 So I googled to check out how other Rpi guys are using MCP23017 to read HX711, ... and I found an inconvenient truth , ... :( Appendices - HX711 ...
by tlfong01
Fri Nov 30, 2018 1:52 pm
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 11[/i][/color] Controlling HX711 using Rpi3B+, MCP23017, and python3 Now I am leaving the weight scale thing and start python programming. I plan to use python ...
by tlfong01
Fri Nov 30, 2018 1:24 pm
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 10[/i][/color] Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 11 So the 5kg load cell full bridge is tested OK. Next step is to test ...
by tlfong01
Fri Nov 30, 2018 1:14 pm
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 9[/i][/color] Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 10 So I calibrated the 5kg load cell and found results OK, though the ...
by tlfong01
Fri Nov 30, 2018 8:16 am
Forum: Automation, sensing and robotics
Topic: Reading old weight scale
Replies: 124
Views: 28568

Re: Reading old weight scale

tlfong01 wrote:
Fri Nov 30, 2018 7:23 am
Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 7
Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 8

Rpi3B+ ESP8266-12 HX711 Based Smart 5kg/1g Weight Scale Making Notes Part 9
...

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