I've updated the design of the the board so it can be used for different skill levels.
- We can get the boards fully SMD assembled, so you only have to mechanically assembly the kit
- a version with just the non-rechargeable CR2032 battery, a switch and 6 SMD blinking LEDs,
- a variant which adds the 555 timer circuit and buzzer to mimic a siren
- add a USB C connector and LDO so you no longer need a battery
- add a LIR2032 battery with charger and protection circuitry for a rechargeable solder kit