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STD Beaglebone black based heating controller
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License: Public Domain
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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PCB
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| 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 |
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