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tlfong01
Posts: 1312
Joined: Sat Jun 02, 2018 1:43 pm
Location: Hong Kong

Re: Relay Module KY-019 5V

Sun Dec 16, 2018 6:40 am

tlfong01 wrote:
Tue Dec 11, 2018 5:03 am
Battery Powered Plant Watering
(Load Cell Testing) RE: READING OLD WEIGHT SCALE - tlfong01 2018nov22
viewtopic.php?f=37&t=227137#p1395349
...

Rpi Smart Scale

Now I am feeling jealous that somebody has a Rpi smart scale, using an expensive balance board, and suscribing US$10 a month. I am a poor hobbist without any educational email account, so I think I can diy one.

(Youtube) Raspberry Pi Smart Scale | GIT TECH'D - 2018dec06 1,592 views
https://www.youtube.com/watch?time_cont ... gj2D52B9n8

With the holidays on the way, it's hard to keep track of all the pumpkin pie and fruit cake you eat, especially with those New Years resolutions lurking just around the corner. That's why we've made a hackable, weight tracking, text messaging scale with a sense of humor. Now your Raspberry Pi can keep you in check as you pack on the holiday pounds.

Raspberry Pi Smart Scale @Raspberry_Pi #PiDay #RaspberryPi - 2018dec14
https://blog.adafruit.com/2018/12/14/ra ... spberrypi/

Are you tired of staring at that boring, bad news bathroom scale every morning? The one that you often say “I hate you” to you as every time you step on it. Why hasn’t anyone made a scale that is actually fun or motivating to use? It is time to create a scale that is not only smart but has a bit more personality to brighten your day. We are going to build our very own hackable, weight tracking, text messaging bathroom scale that comes with a built-in sense of humor.

This is a fun, easy project that combines a Wii balance board, a Raspberry Pi, and an online data analytics platform to create a web-connected scale controlled by a Python script you can hack.

Raspberry Pi Smart Scale - Elizabeth Adams 2018dec10
https://www.hackster.io/elizabethna/ras ... ale-5ae2a2
...
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I am an electronics and smart home hobbyist.

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tlfong01
Posts: 1312
Joined: Sat Jun 02, 2018 1:43 pm
Location: Hong Kong

Re: Relay Module KY-019 5V

Sun Dec 16, 2018 7:06 am

tlfong01 wrote:
Sun Dec 16, 2018 6:40 am
Rpi Smart Scale
Now I am feeling jealous that somebody has a Rpi smart scale, using an expensive balance board, and suscribing US$10 a month. I am a poor hobbist without any educational email account, so I think I can diy one.
(Youtube) Raspberry Pi Smart Scale | GIT TECH'D - 2018dec06 1,592 views
https://www.youtube.com/watch?time_cont ... gj2D52B9n8

My Scale to hack

...
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I am an electronics and smart home hobbyist.

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tlfong01
Posts: 1312
Joined: Sat Jun 02, 2018 1:43 pm
Location: Hong Kong

Re: Relay Module KY-019 5V

Sun Dec 16, 2018 7:14 am

tlfong01 wrote:
Sun Dec 16, 2018 7:06 am
tlfong01 wrote:
Sun Dec 16, 2018 6:40 am
Rpi Smart Scale
Now I am feeling jealous that somebody has a Rpi smart scale, using an expensive balance board, and suscribing US$10 a month. I am a poor hobbist without any educational email account, so I think I can diy one.
(Youtube) Raspberry Pi Smart Scale | GIT TECH'D - 2018dec06 1,592 views
https://www.youtube.com/watch?time_cont ... gj2D52B9n8

My Scale to hack
...
Attachments
my_scale_2018dec1602.jpg
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I am an electronics and smart home hobbyist.

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tlfong01
Posts: 1312
Joined: Sat Jun 02, 2018 1:43 pm
Location: Hong Kong

Re: Relay Module KY-019 5V

Mon Dec 17, 2018 9:15 am

tlfong01 wrote:
Sun Dec 16, 2018 7:14 am
Rpi Smart Scale
Now I am feeling jealous that somebody has a Rpi smart scale, using an expensive balance board, and subscription US$10 a month. I am a poor hobbyist without any educational email account, so I think perhaps I can DIY one.

My HK$330 Scale to hack
...
Attachments
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tlfong01
Posts: 1312
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Location: Hong Kong

Re: Relay Module KY-019 5V

Mon Dec 17, 2018 2:38 pm

tlfong01 wrote:
Mon Dec 17, 2018 9:15 am
tlfong01 wrote:
Sun Dec 16, 2018 7:14 am
Rpi Smart Scale
Now I am feeling jealous that somebody has a Rpi smart scale, using an Wii Balance Board, and subscription US$10 a month to some website. I am a poor hobbyist without any educational email account, so I think I must DIY one.
My HK$330 Scale to hack

The Half Wheatstone Bridge x 4 to Full Bridge Adaptor Assembly Notes

References
(Smart Kitchen Scale) RE: READING OLD WEIGHT SCALE - tlfong01 2018-Nov-29
viewtopic.php?f=37&t=227137&start=50#p1398358
viewtopic.php?f=37&t=227137&start=50#p1398596
viewtopic.php?f=37&t=227137&start=50#p1398602
viewtopic.php?f=37&t=227137&start=50#p1398665
...
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tlfong01
Posts: 1312
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Location: Hong Kong

Re: Relay Module KY-019 5V

Tue Dec 18, 2018 3:47 am

tlfong01 wrote:
Mon Dec 17, 2018 2:38 pm
tlfong01 wrote:
Mon Dec 17, 2018 9:15 am
My HK$330 Scale to hack

Tanita HD660 Spec

HD660 for HK$290 is Tanita's cheapest scale I could find! :(
...
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tlfong01
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Location: Hong Kong

Re: Relay Module KY-019 5V

Tue Dec 18, 2018 3:50 am

tlfong01 wrote:
Tue Dec 18, 2018 3:47 am
Tanita HD660 Spec
HD660 for HK$290 is Tanita's cheapest scale I could find! :(

HD660 Load Cell Calibration

...
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tlfong01
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Location: Hong Kong

Re: Relay Module KY-019 5V

Tue Dec 18, 2018 4:19 am

tlfong01 wrote:
Tue Dec 18, 2018 3:50 am
HD660 Load Cell Calibration

Load Cell Calibration Setup Notes

Results
input = 5V
no load = 0.25 mV
10 lbs = 0.50 mV
Sensitivity = 10lb x 1/2.2kg/lb = 4.55kg = ? (lunch time, hungry, forgot how to calculate! :mrgreen:)

...
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tlfong01
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Re: Relay Module KY-019 5V

Tue Dec 18, 2018 9:41 am

tlfong01 wrote:
Tue Dec 18, 2018 4:19 am
HD660 Load Cell Calibration
Load Cell Calibration Setup Notes
Calibration Results 1

Calibration Results 2

I used 3 loading points to check linearity and found results very good in the range 65kg to 70kg. But the sensitivity numbers are bad. I guess the reason is that the Excel worksheet 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:

...
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tlfong01
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Re: Relay Module KY-019 5V

Tue Dec 18, 2018 1:51 pm

tlfong01 wrote:
Tue Dec 18, 2018 9:41 am
Calibration Results 2
I used 3 loading points to check linearity and found results very good in the range 65kg to 70kg. But the sensitivity numbers are bad. I guess the reason is that the Excel worksheet 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 0.05mV. After HX711 ADC, the linearity should improve.

I have extended the digital scales load cell connected wires to about 3 meters long, using MIZU UL Wire AWG #26 UL1007. The resistance of 3 meters long wire is about 1 to 2 Ohms. So the effect on the bridge resistances of about 900R x 8 is not noticeable.

The load cell calibration is now complete. Next step is going back to python programming of SPI MCP23S17 to control HX711.

SPI Testing Notes
viewtopic.php?f=37&t=227137&p=1403249#p1403249
...
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tlfong01
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Location: Hong Kong

Re: Relay Module KY-019 5V

Thu Dec 20, 2018 2:44 am

tlfong01 wrote:
Wed Oct 17, 2018 1:05 pm
tlfong01 wrote:
Wed Oct 17, 2018 12:18 pm
Now I am going to test DC12V a solenoid value.

Sea DN15 DC 5~12V Hall Effect Water Flow Sensor

Now I am going to test the 14 yuan DC 5~12V Hall effect water flow sensor. I am not sure if this meter can submerge in water.

G1/2inch DN15 Transparent Water Flow Meter Flow Meter Hall Flow Sensor Indicator Counter Full Copper Water Flow Sensor US $3.20
https://www.aliexpress.com/item/G1-2inc ... c57808a8c3

https://item.taobao.com/item.htm?spm=a1 ... 4700477132

Water Flow Meter Tear Down Notes

Magnetic Flow Meter Principles (Chinese) - NingPo WaterMeter 2017-09-15
https://kknews.cc/zh-hk/news/jr4jzqe.html
...
Attachments
water_meter_teardown_2018dec2001.jpg
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tlfong01
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Re: Relay Module KY-019 5V

Wed Dec 26, 2018 1:50 am

tlfong01 wrote:
Sun Dec 16, 2018 7:06 am
Now I am feeling jealous that somebody has a Rpi smart scale, ... I think I can diy one.
My Scale to hack

For your cats only - CN¥40 body scale hacking notes

Cat Scale - CN¥40 / US$60

https://detail.tmall.com/item.htm?id=58 ... 3ad4rols9X

https://www.aliexpress.com/item/Meilen- ... 59415.html

...
Attachments
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tlfong01
Posts: 1312
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Location: Hong Kong

Re: Relay Module KY-019 5V

Wed Dec 26, 2018 5:25 am

tlfong01 wrote:
Thu Dec 20, 2018 2:44 am
tlfong01 wrote:
Wed Oct 17, 2018 1:05 pm
tlfong01 wrote:
Wed Oct 17, 2018 12:18 pm
Now I am going to test DC12V a solenoid value.
Sea DN15 DC 5~12V Hall Effect Water Flow Sensor
Now I am going to test the 14 yuan DC 5~12V Hall effect water flow sensor. I am not sure if this meter can submerge in water.
G1/2inch DN15 Transparent Water Flow Meter Flow Meter Hall Flow Sensor Indicator Counter Full Copper Water Flow Sensor US $3.20
https://www.aliexpress.com/item/G1-2inc ... c57808a8c3
https://item.taobao.com/item.htm?spm=a1 ... 4700477132
Water Flow Meter Tear Down Notes
Magnetic Flow Meter Principles (Chinese) - NingPo WaterMeter 2017-09-15
https://kknews.cc/zh-hk/news/jr4jzqe.html
...

Reed switch and Hall effect module testing notes


effective distance = approx 10mm

Water meter disassembled and reassembled - still working! :mrgreen:
(youtube) https://youtu.be/bKaugj7H3pg
...
Attachments
reed_switch_hall_effect_2018dec2602.jpg
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tlfong01
Posts: 1312
Joined: Sat Jun 02, 2018 1:43 pm
Location: Hong Kong

Re: Relay Module KY-019 5V

Tue Jan 22, 2019 5:55 am

tlfong01 wrote:
Wed Dec 26, 2018 5:25 am
Water Flow Meter Tear Down Notes
Magnetic Flow Meter Principles (Chinese) - NingPo WaterMeter 2017-09-15
https://kknews.cc/zh-hk/news/jr4jzqe.html
...
Reed switch and Hall effect module testing notes

effective distance = approx 10mm
Water meter disassembled and reassembled - still working! :mrgreen:
(youtube) https://youtu.be/bKaugj7H3pg

Forking Thread Notes

https://www.raspberrypi.org/forums/view ... 7&t=231795

...
Attachments
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I am an electronics and smart home hobbyist.

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