Beaglebone black based heating controller

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STD Beaglebone black based heating controller

License: Public Domain

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Update time： 2020-12-30 23:37:20

Creation time： 2015-07-20 22:00:51

Description

BBB based heating controller [22 Aug 2016] I fixed the ULN2803 package and GND on P20. Still need to investigate if there is a pull down resistor needed for Q1 Issues found during assembling the PCB: - ULN2803 package is incorrect - it should be SOIC18. I will correct the PCB soon - GND pin in the P20 5V/12V connector is not actually connected to GND - The heartbeat LED is on when you start the BBB. There is ~0.6V on the Q1 gate which seems to be enough to trigger it. Probably needs to be pulled down externally by a resistor.

Design Drawing

schematic diagram

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Controller schematic
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PCB

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Controller PCB
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	BEAGLEBONE_OUTLINE	P0	BEAGLE_BONE_BLACK_CAPE	1
2	ULN2803	U2	SO018	1
3	RELAY_RELAY-JZC	RELAY1,RELAY2,RELAY3,RELAY4,RELAY5,RELAY6,RELAY7,RELAY8	RELAY-SRD-12VDC	8
4	1k	R1,R2,R3,R4,R5,R6,R7,R8,R10	R0805	9
5	LED	D1,D2,D3,D4,D5,D6,D7,D8	LED_0805	8
6	RJ11 6p4c	P1,P2,P3,P4,P5,P6	RJ11-6	6
7	BSS138	Q1	SOT23	1
8	HARTBEAT LED	D9	LED_0805	1
9	JUMPER-4	JP1,JP2,JP3,JP4,JP5,JP6,JP7,JP8	1X04	8
10	AKL701_215	P10,P11,P12,P13,P14,P15,P16,P17	1X2 5MM SCREW TERMINALS	8
11	I2C DISPLAY	P8-I2C	HDR1X5	1
12	SPI	P9-SPI	HDR1X8	1
13	AC IMPUT	CN1	1X2 5MM SCREW TERMINALS	1
14	DC INPUT	P20	SCREWTERMINAL-3.5MM-3	1
15	FUSE	F1	FUSE_5MM	1
16	AC to DC PSU	U1	EBAY PSU PCB	1
17	PSU INPUT	CN2	1X2 5MM SCREW TERMINALS	1
18	DS2482-100S	U3	S08	1
19	100	R9	R0805	1
20	V_REG_LM1117	U4	SOT223	1
21	10u	C1,C2	CP_4X5MM	2
22	100n	C3,C4,C5,C6,C7,C8,C9,C10	C0805	8
23	SIP6	P7	HDR1X6	1