T12 electric soldering iron beggars version

B site link: BV1xz4y1q7r4
main control Atmega328 or 168
power supply using 12V1.5AQC charger
 
Operation instructions:
Plug in and start up: After powering on, turn the tail switch to OFF and then turn it back to ON to trick 12V
-- Press down to enter settings
-- middle The lower left light of the bit light is on: Set the sleep time: Press down to enter
---- The upper left light of the middle bit light is on: Set the temperature: Press down to enter
---- Automatically save
-- Press up to start
---- Display the temperature or perform temporary temperature settings (It will not be saved)
----The first position cannot be displayed normally under 200 degrees
----Not moved for a long time: sleep
--long press the up and down buttons at the same time
----sleep mode
--RST button
---- The reset
 
firmware is compiled using arduino and uploaded using a programmer to avoid suffix bootloader abnormalities such as PAPB.
When using Atmega168, the total cost is about 25.
Maybe Atmega88 can be used. The program compiles normally but there is no test.