Chopping Board Scales

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Revision as of 00:29, 11 January 2014 by Amx109 (talk | contribs) (Sensors)
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Participants Amx109
Status Planning
Niche Other
Purpose Fun

purpose: to build a big chopping board with inbuilt scale


  • 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


Inspired by

load cell:


Chopping board:



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


Red Black White

White->black=2k White->Red=1k Red->Black=1k