Chalkroach Pin # (rev19)	Chalkroach (rev20)	Atmega Pin #	Function
1	40	21	PD7 (OC2)
2	39	20	PD6 (ICP1)
3	38	22	PC0 (SCL)
4	37	19	PD5 (OC1A)
5	36	23	PC1 (SDA)
6	35	18	PD4 (OC1B)
7	34	24	PC2 (TCK)
8	33	17	PD3 (INT1)
9	32	25	PC3 (TMS)
10	31	16	PD2 (INT0)
11	30	26	PC4 (TDO)
12	29	15	TXD
13	28	27	PC5 (TDI)
14	27	14	RXD
15	26	28	PC6 (TOSC1)
16	25	11/31	GND
17	24	17	PC7 (TOSC2)
18	23	11/31	GND
19	22	30	AVCC
20	21	10	+5V
21	20	11/31	GND
22	19	10	+5V
23	18	32	AREF
24	17	9	RESET/
25	16	33	PA7 (ADC7)
26	15	8	PB7 (SCK)
27	14	34	PA6 (ADC6)
28	13	7	PB6 (MISO)
29	12	35	PA5 (ADC5)
30	11	6	PB5 (MOSI)
31	10	36	PA4 (ADC4)
32	9	5	PB4 (SS/)
33	8	37	PA3 (ADC3)
34	7	4	PB3 (OC0/AIN1)
35	6	38	PA2 (ADC2)
36	5	3	PB2 (INT2/AIN0)
37	4	39	PA1 (ADC1)
38	3	2	PB1 (T1)
39	2	40	PA0 (ADC0)
40	1	1	PB0 (XCK/T0)

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