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For the speed control of my Maxun One solar bike, I use an up-down thumb-throttle switch. Normally, such a throttle is mounted between grip and the brake lever which increases the distance between them, see for instance the Bionx throttle or the Shimano switch unit SW EM800 L. That's not handy. That's why I made a throttle that is mounted on top of the brake lever clamp so that no extra space is needed on the handlebar.

Ergonomic space saving ebike thumb throttle
Ergonomic space saving ebike thumb throttle switch

Bionx thumb throttle
Bionx thumb throttle

Shimano switch unit SW EM800 L
Shimano switch unit SW EM800 L

Sensitive tactile switches

Since you have to press the buttons very often, very sensitive tactile switches are used so that you only have to press very lightly: the Panasonic EVQ-P6DB35 tactile switches are also watertight (IP68)

Ergonomic space saving e bike thumb throttle switch
Ergonomic space saving e bike thumb throttle switch

 These are the parts:

DIY e-bike thumb throttle parts
DIY e-bike thumb throttle parts

 This is the throttle with the PCBs glued on it:

IP68 tactile push buttons
IP68 tactile push buttons

 Glue it to the brake lever with 3M VHB tape:

3M VHB tape
3M VHB tape

 Side view:

Ergonomic push button throttle
Ergonomic push button throttle

 The throttle internal wiring:

E bike speed throttle wiring
E bike speed throttle wiring

Contact me for the design files.

Do you have any comments about the website? Please let me know.