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These are very slim
The problem is that heart rate can be difficult to measure
Nano Coat Technology
Product Advantages:
Housing Number : KP001
Membrane Keypad 20 Key (Matrix 4x5) magnetic These are very slimMembrane (Flexible) Keypad, 4x5 key matrix Pad Size: 75 x 85 x 1mm Cable Length: 104 mm Weight: 9g Connector: Dupont 8 pins, 2. 54mm Pitch Mount Style: Self Adherence Max. Circuit Rating: 35VDC, 100mA Insulation Spec.: 100M Ohm, 100V Operation Temperature: 20 to +40 C For how to use the keypad with arduino and code, please click here
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