voltlog/Voltlogger17More info about this project in Voltlog #368. If you would like to order one of these boards ready assembled, check out my Tindie store.
Logger is an open-source printed circuit board by voltlog, from the voltlog/Voltlogger repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 60 × 90 mm with 111 parts on 109 nets, routed with 1,047 tracks and 270 vias.
It is built around the CP2104EK, ESP32-WROOM-32D and MAX31855KASA+T, with the MMBT3904, SP0504BAHTG and SS14 among its other parts. Its parts include 30 capacitors, 20 inductors, 15 resistors, 13 ICs and 13 connectors. It belongs with the ESP32 boards of this library.
This repository contains the source files for the Voltlogger, a 10 channel thermocouple data logger built around the ESP32 and the MAX31855 thermocouple interface chip. This project was shown in Voltlog #368.
Schematic constains a bug, where IO34 & IO35 are connected to chip select signals for thermocouple interface chips #1 and #2. These pins are input only on the ESP32 so they cannot drive the CS pis on Th1 & Th2. The workaround is to connect these CS pins to IO22 and IO23. ESD protection diodes seem to be causing signal integrity issues on the SD card interface so leave those unpopulated until this issue is debugged further.
More info about this project in Voltlog #368. If you would like to order one of these boards ready assembled, check out my Tindie store.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 470R | Inductor_SMD:L_0603_1608Metric | L1, L2, L3, L4, L5, L10, L11, L12, L13, L14, L15, L16, L17, L18, L19, L20 +4 |
| 13 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C2, C3, C9, C11, C13, C15, C17, C19, C21, C23, C25, C27, C29 |
| 10 | 0.01uF | Capacitor_SMD:C_0603_1608Metric | C12, C14, C16, C18, C20, C22, C24, C26, C28, C30 |
| 10 | Conn_01x02 | TerminalBlock_MetzConnect:TerminalBlock_MetzConnect_Type094_RT03502HBLU_1x02_P5.00mm_Horizontal | J1, J2, J3, J4, J5, J6, J7, J8, J9, J10 |
| 10 | MAX31855KASA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3, U4, U5, U6, U7, U8, U9, U10 |
| 7 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R11, R12, R13, R14, R15, R16 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_ISO7380_Pad | H1, H2, H3, H4 |
| 3 | 1K | Resistor_SMD:R_0603_1608Metric | R5, R6, R7 |
| 3 | Fiducial | Fiducial:Fiducial_0.75mm_Mask1.5mm | FID1, FID2, FID3 |
| 3 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 3 | SP0504BAHT | Package_TO_SOT_SMD:SOT-23-5 | D1, D2, D6 |
| 2 | 10K | Resistor_SMD:R_Array_Convex_4x0603 | R3, R4 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric | C1, C6 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 1 | 0.5A | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 4.7nF | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | CP2104 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U13 |
| 1 | ESP32-WROOM-32D | RF_Module:ESP32-WROOM-32 | U11 |
| 1 | EXT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J13 |
| 1 | Micro_SD_Card | Voltlog:XKTF-015-N | J11 |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U12 |
| 1 | NO | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | SS14 | Diode_SMD:D_SMA | D7 |
| 1 | USB_C_Receptacle_USB2.0 | Voltlog:TYPE-C-31-M-12 | J12 |
| 1 | VOLTLOG_LOGO | Voltlog:voltlog_mask_5mm | V1 |
| 1 | blue | LED_SMD:LED_0603_1608Metric | D5 |
| 1 | green | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | red | LED_SMD:LED_0603_1608Metric | D4 |
It measures 60 × 90 mm and has 2 copper layers, 1.6 mm thick.
111 parts, built around the CP2104EK, ESP32-WROOM-32D, MAX31855KASA+T and MMBT3904. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the voltlog/Voltlogger repository on GitHub, at the commit this page was made from: the board is Kicad/logger.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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