Difference between revisions of "Chopping Board Scales"
(Created page with "{{Project |ProjectStatus=Planning |ProjectNiche=Other |ProjectPurpose=Fun }} purpose: to build a big chopping board with inbuilt scale
= Design =
* Waterproof
* must di...") |
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{{Project | {{Project | ||
| − | |ProjectStatus= | + | |ProjectStatus=Dead |
|ProjectNiche=Other | |ProjectNiche=Other | ||
|ProjectPurpose=Fun | |ProjectPurpose=Fun | ||
| Line 10: | Line 10: | ||
* Waterproof | * Waterproof | ||
* must display weight on surface of chopping board | * must display weight on surface of chopping board | ||
| − | * | + | * minimum 'maximum weight' of 5kg, with minimum 1g increments. pref 0.1g |
| − | * | + | * touch sensitive button |
| + | ** on/tare | ||
== Electronics == | == Electronics == | ||
Inspired by http://jdesbonnet.blogspot.co.uk/2010_10_01_archive.html | Inspired by http://jdesbonnet.blogspot.co.uk/2010_10_01_archive.html | ||
| + | |||
| + | load cell: http://www.ebay.co.uk/itm/22-lbs-10Kg-Aluminium-Alloy-Hopper-Scale-Load-Cell-Transducer-/290913452703?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item43bbcb029f | ||
= Materials = | = Materials = | ||
| Line 23: | Line 26: | ||
* http://www.ikea.com/nl/nl/catalog/products/90115544/ | * http://www.ikea.com/nl/nl/catalog/products/90115544/ | ||
* http://www.ikea.com/nl/nl/catalog/products/00233429/ | * http://www.ikea.com/nl/nl/catalog/products/00233429/ | ||
| + | |||
| + | ==Sensors== | ||
| + | Specification: | ||
| + | |||
| + | Size: 34mmX34mm | ||
| + | |||
| + | Internal 1000 Ohm half-bridge strain gauge load cell, range is 50kg, half-bridge structure. | ||
| + | |||
| + | When measuring, the correct force is applied to the outer side of the strain E-shaped beam portion of the sensor (i.e., a strain gauge affixed to the middle, with a beam of white plastic cover arm) and the outside edges to form a shear force in the opposite direction, i.e., in the middle of strain beam bending necessary changes can occur under stress, strain beam side by another force can not have a barrier. | ||
| + | |||
| + | The sensor use the following three methods: | ||
| + | |||
| + | 1, using a sensor with external resistors full bridge measurement range of a sensor range: 50kg. Higher requirements for external resistor | ||
| + | |||
| + | 2, the use of only two full-bridge sensors measuring range is the range of the two sensors and: 50kgx2 = 100kg | ||
| + | |||
| + | 3, the use of four full-bridge sensors measuring range is the range of four sensors and: 50kgx4 = 200kg | ||
| + | |||
| + | |||
| + | === Wires === | ||
| + | |||
| + | Red<br> | ||
| + | Black<br> | ||
| + | White<br> | ||
| + | |||
| + | White->black=2k<br> | ||
| + | White->Red=1k<br> | ||
| + | Red->Black=1k<br> | ||
Latest revision as of 17:19, 17 August 2016
| Projects | |
|---|---|
| Participants | Amx109 |
| Skills | |
| Status | Dead |
| Niche | Other |
| Purpose | Fun |
purpose: to build a big chopping board with inbuilt scale
Design
- Waterproof
- must display weight on surface of chopping board
- minimum 'maximum weight' of 5kg, with minimum 1g increments. pref 0.1g
- touch sensitive button
- on/tare
Electronics
Inspired by http://jdesbonnet.blogspot.co.uk/2010_10_01_archive.html
Materials
Chopping board:
- http://www.ikea.com/nl/nl/catalog/products/90115544/
- http://www.ikea.com/nl/nl/catalog/products/00233429/
Sensors
Specification:
Size: 34mmX34mm
Internal 1000 Ohm half-bridge strain gauge load cell, range is 50kg, half-bridge structure.
When measuring, the correct force is applied to the outer side of the strain E-shaped beam portion of the sensor (i.e., a strain gauge affixed to the middle, with a beam of white plastic cover arm) and the outside edges to form a shear force in the opposite direction, i.e., in the middle of strain beam bending necessary changes can occur under stress, strain beam side by another force can not have a barrier.
The sensor use the following three methods:
1, using a sensor with external resistors full bridge measurement range of a sensor range: 50kg. Higher requirements for external resistor
2, the use of only two full-bridge sensors measuring range is the range of the two sensors and: 50kgx2 = 100kg
3, the use of four full-bridge sensors measuring range is the range of four sensors and: 50kgx4 = 200kg
Wires
Red
Black
White
White->black=2k
White->Red=1k
Red->Black=1k
