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Beaglebone black based heating controller

4 years ago 2354
  • Description
  • Documents
  • BOM
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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.

Documents

Controller schematic

Controller PCB

BOM

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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Members

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