Digital clock with mechanical 7-segment display units

• This clock uses four mechanical 7-segment display units, at [https://www.thingiverse.com/thing:5066794](https://www.thingiverse.com/thing:5066794)
• Here I provide the base to arrange four units, rear cover and clock codes

Video

How to make

You need

• Four mechanical 7-segment display units, already published at [https://www.thingiverse.com/thing:5066794](https://www.thingiverse.com/thing:5066794)
• 2mm tapping screws
• micro:bit
• Ks0360 Keyestudio Sensor Shield V2, [https://wiki.keyestudio.com/Ks0360_Keyestudio_Sensor_Shield_V2_for_BBC_micro:bit](https://wiki.keyestudio.com/Ks0360_Keyestudio_Sensor_Shield_V2_for_BBC_micro:bit)

(other micro controllers can be used if it can handle 4 servos)

How to make

• Assemble 4 display units. Follow the instructions at [https://www.thingiverse.com/thing:5066794](https://www.thingiverse.com/thing:5066794)
• Attach display units to the base, using 2mm tapping screws
• Fix the top of the neighboring display units using retainer.stl and screws
• Attach Ks0360 board to the bottom of the base
• Insert micro:bit to Ks0360 board
• Set rear covers (print two instances)

Adjustments of the position of the servos

### offset adjustment

• visit the site at [https://makecode.microbit.org/](https://makecode.microbit.org/) and upload check-offset2.hex
• fill the "offmap" table with zeros
• download the editted .hex file from the micro:bit site and flash it to the micro:bit board
• Find the best offset values. A/B button increases / decreases the offset value. Press A and B buttons simultaneously to increase the number to be shown (0-9).
• Write down the found offset values to the source code and check again.

using clock code

• upload clock.hex to micro:bit site
• Copy the offmap table from check-offset2.hex to clock.hex
• download the .hex file and flash it to the micro:bit

Category: Gadgets