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STD BanFlow
License: Public Domain
Mode: Editors' pick
A six Mass Flow Controller PCB for MKS/Tylan card-edge connector style MFCs. The sockets are wired for standard 20-pin IDC cables with a card-edge connector on one end.
The case, and arduino code, are available on github here:
https://github.com/toastedcrumpets/BanFlow
The circuit uses a Teensy 3.6 and its ADCs to read flow voltages and digital IO to command valve open/shut. It also uses six MCP4725 DACs to set the flow across three SPI buses.
NOTE: You must disconnect the pull-ups on the MCP4725's, as they will pull the logic levels to 5V, but the Teensy 3.6 is 3.3V. I have included 3.3V pullups for the I2C buses on the PCB. You must also alternate the A0 pin on the breakout modules as we run two DACs per bus. You will also need to check the bus address of the modules you have. Adafruit have theirs at a different address to Aliexpress!
Current bugs are listed below:
ID | Name | Designator | Footprint | Quantity |
---|---|---|---|---|
1 | 100nF | C1,C6,C9,C12,C15,C18 | C0805 | 6 |
2 | 220pF | C2,C3,C4,C5,C7,C8,C10,C11,C13,C14,C16,C17 | C0603 | 12 |
3 | 1uF | C19,C20 | C0603 | 2 |
4 | X9555WV-2X10-PTV01 | CN1,CN2,CN3,CN4,CN5,CN6 | IDC-TH_X9555WV-2X10-PTV01 | 6 |
5 | DC-005 5.5-2.0MM | DC1 | DC-IN-TH_DC-5520-1 | 1 |
6 | CONN-TH_2P-P5.00 | P1 | CONN-TH_2P-P5.00 | 1 |
7 | ITX1215S Fixed | PS1,PS2,PS3,PS4,PS5,PS6 | ITX1215S | 6 |
8 | 2K | R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,R15,R16 | R0603 | 16 |
9 | 8.2K | R17 | R0603 | 1 |
10 | 4.7K | R18,R19,R20,R21,R22,R23 | R0603 | 6 |
11 | 1.8K | R24,R27,R29,R31,R33,R35 | R0805 | 6 |
12 | 3.3K | R25,R26,R28,R30,R32,R34 | R0805 | 6 |
13 | Teensy_3.6 | U1 | TEENSY_3.6 | 1 |
14 | MCP4725 Breakout Board | U2,U3,U4,U5,U6,U7 | MCP4725 | 6 |
15 | CJ431_C3113 | U8 | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | 1 |
16 | LM317AG-TN3-R | U9 | TO-252-2_L6.5-W6.1-P4.58-LS10.0-TL | 1 |
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