At CCCamp 2019 there are a few electronic kits available for soldering, some related to our goal, some not.
But anyway, here is the info you were looking for!
Kit A: Solar powered noise maker:
This kit is a simple bleeping sound generator, it has all SMD parts except for the headphone connector and the solar panel.
The PCB and components are RoHS compatible, but you could use leaded solder too. The small point on the outline of the LEDs is the anode/positive side of the LED. If you have finished soldering the PCB and there is a bit of light it should make some noise. Place your ear near the piezo or attach stereo headphones. The LEDs only blink in bright lights. The pads on the outside of the PCB can be used as finger contacts or to solder other components to influence the sound. The (-) pad on the top side of the picture is not connected correctly, but the other (-) pad is.
Kit B: The EMF detector / RevSniffer:
The schematic is pretty simple, but it works in a complex way. Any of the three transistors can work as an amplifier or detector. It all depends on the strength of the signal. After assembling, hold the button and point the inductor/antenna to the device you want to listen to. If there is a static or no field, you will hear some hissing noise, that's the noise generated by the electrons dancing inside the transistors. If there is a stable high frequency field, you will hear nothing, if there is some modulation, this will make all kinds of nice noises, from simple clicks to highly complex and beautiful sounds! Have fun! The provided headphones are cheap, so if you don't hear anything, try another set.
Kit C: The AD(H)D timer
This kit has a microcontroller that needs some programming, so if you have bought the kit and did not let your chip be programmed at camp, please contact me (benadski) for a solution!
; ; ADDtimer.asm ; ; Created: 11/07/2019 21:43:20 ; Author : Wilenzo ; ; ___ ; VCC -|* |- GND ; SW2 and TPI A0 -| |- B3 POT wiper ; TPI A1 -| |- B2 POT V+ and buzzer ; TPI /R -|___|- B1 SW1 and LEDs .def locl = r16 .def stat = r17 .def dly1 = r18 .def dly2 = r19 .def dlyi = r20 .def loci = r21 .def tmrd = r22 ;.def ; Status byte .equ SLP = 0 ; Set before sleep is executed .equ ACP = 1 ; Analog conversion pending .equ SLR = 2 ; Sleep request .equ ALM = 3 ; Alarm (beeper and LEDs) ; I/O pins or ADC channel .equ SW2 = 0 .equ BTN = 1 .equ LED = 1 .equ BUZ = 2 .equ POTP = 2 .equ POTW = 7 ; Helpers .equ VLMON = (1<<VLM1)|(1<<VLM0)|(1<<VLMIE) ; Init .org $0000 rjmp RESET_vect .org $0001 rjmp INT0_vect .org $0006 rjmp TIM0_CA_vect .org $000A rjmp VLM_vect .org $000B rjmp ADC_vect ;Handles button and wake function INT0_vect: ; Wait for pin to get high, set pot positive high, wait a few msecs in loci, SREG push loci WAIT_PIN: sbis PINB, BTN rjmp WAIT_PIN sbr stat, (1<<ACP) sbi PORTB, POTP I0SNOOZE: dec dlyi brne I0SNOOZE ; Check if awoken from sleep, if so: reset flag and ... sbrs stat, SLP rjmp NOSLEEP cbr stat, (1<<SLP) in locl, SMCR andi locl, ~(1<<SE) out SMCR, locl NOSLEEP: ; Code for button processing, start A/D conversion sbi ADCSRA, ADSC INT0_end: pop loci out SREG, loci reti ; Timing, fires every 30 seconds TIM0_CA_vect: in loci, SREG push loci ;cpi tmrd, 0 ;breq REPEAT dec tmrd brne TIM0_END ldi tmrd, 255 sbr stat, (1<<ALM) sbis PINA, SW2 rjmp REPEAT rcall LED_OFF sbr stat, (1<<SLR) rjmp TIM0_END REPEAT: sbr stat, (1<<ACP) sbi PORTB, POTP T0SNOOZE: dec dlyi brne T0SNOOZE sbi ADCSRA, ADSC TIM0_END: pop loci out SREG, loci reti ; Voltage level too low? Flash LED, do nothing else VLM_vect: in loci, SREG push loci sbi DDRB, LED ENDLESS: dec dlyi brne ENDLESS sbrc loci, 6 rcall LED_ON dec loci brne ENDLESS ldi loci, 80 rcall LED_OFF rjmp ENDLESS pop loci out SREG, loci reti ; Conversion complete, set pot positive to 0V, process value ADC_vect: in loci, SREG push loci cbi PORTB, POTP cbr stat, (1<<ACP) in tmrd, ADCH lsr tmrd cpi tmrd, 10 brsh MAX_VAL ldi tmrd, 10 MAX_VAL: cpi tmrd, 120 brlo VAL_OK ldi tmrd, 120 VAL_OK: pop loci out SREG, loci reti ; LED on (with safe pushbutton thing) LED_ON: ldi locl, 0 out EIMSK, locl ; INT0 off nop nop cbi PORTB, LED sbi DDRB, LED ret ; LED off (with safe pushbutton thing) LED_OFF: cbi DDRB, LED sbi PORTB, LED nop nop ldi locl, (1<<INT0) out EIMSK, locl ; INT0 (low level for waking from sleep) ret RESET_vect: cli clr stat ldi locl, low(RAMEND) out SPL, locl ldi locl, high(RAMEND) out SPH, locl ; Set clock speed to 128kHz ldi locl, 0xD8 out CCP, locl ldi locl, (1<<CLKMS0) out CLKMSR, locl ldi locl, 0xD8 out CCP, locl clr locl out CLKPSR, locl ; I/O init ldi locl, (1<<SW2) out PUEA, locl ldi locl, (1<<BUZ) out DDRB, locl ldi locl, (1<<BTN) out PUEB, locl FLASH: rcall LED_ON dec dly1 brne FLASH rcall LED_OFF ; ADC setup, point mux to pot wiper enable with interrupt, left adjust and turn off digital input ldi locl, POTW out ADMUX, locl ldi locl, (1<<ADEN)|(1<<ADIE) out ADCSRA, locl ldi locl, (1<<ADLAR) out ADCSRB, locl ldi locl, (1<<POTW) out DIDR0, locl ; VLM setup (off for now) ldi locl, 0 out VLMCSR, locl ; Interrupts setup ldi locl, (1<<INT0) out EIMSK, locl ; INT0 (low level for waking from sleep) ldi locl, 0x60 ldi loci, 0xEA out OCR0AH, loci ; Set timer compare match at 60000 out OCR0AL, locl ldi locl, (1<<CS00)|(1<<CS01)|(1<<WGM02) out TCCR0B, locl ; CLKtmr = CLKio/64 => 2000Hz ldi locl, (1<<OCIE0A) out TIMSK0, locl ; Interrupt fires every 30 seconds. ; Set sleep mode to power down ldi locl, (1<<SM1) out SMCR, locl ; (1<<SE) just before sleep instruction and clear after waking. ; Enable interrupts and go sei rjmp MAIN ZZZ: cbr stat, (1<<SLR) sbr stat, (1<<SLP) in locl, SMCR ori locl, (1<<SE) out SMCR, locl sleep rjmp MAIN ; Check if battery voltage is OK, delay is for settling time. VLM_CHECK: sbrc stat, ACP ret sbis PORTB, LED ret sbic PORTB, BUZ ret ldi locl, VLMON out VLMCSR, locl ldi dly1, 4 VLM_DLY: dec dly1 brne VLM_DLY ldi locl, 0 out VLMCSR, locl ret ; LED and buzzer sequence ALARM: ldi dly2, 5 ALARM_LOOP: ;sbi PORTB, BUZ piezo only cbi PORTB, BUZ rcall LED_ON ;cbi PORTB, BUZ piezo only dec dly1 brne ALARM_LOOP rcall LED_OFF sbi PORTB, BUZ BLEEP: ; sbi PORTB, BUZ piezo only nop nop nop nop nop nop nop nop nop ; cbi PORTB, BUZ piezo only nop nop nop nop nop nop dec dly1 brne BLEEP dec dly2 brne ALARM_LOOP cbr stat, (1<<ALM) cbi PORTB, BUZ ret ; Just wait here and check voltage from time to time MAIN: dec dly1 brne MAIN sbrc stat, ALM rcall ALARM dec dly2 brne MAIN rcall VLM_CHECK sbrc stat, SLR rjmp ZZZ rjmp MAIN
Kit D: The Lithium cell balancer PCB
This kit is an intelligent cell balancer prototype, the microcontroller can be programmed to read out the cell voltage, discharge the cell to a certain voltage and to send a undervoltage or overvoltage signal on a bus to another PCB that controls charging and discharging of the whole pack (or single cell).
More info here!