2 layers140.5 × 30 mm
Type e
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
16 parts3kApache-2.0
2 layers26.4 × 51.2 mm
Din isolated SPI
BitKnitting/FitHome_Controller_PCBI plan to support Feather LoRa and Huzzah. This way, I can do either RFM95 or wifi. ### Huzzah Previously, I used pins 0 and 15 for the two CS pins. Here is the pinout diagram for the Huzzah:
- Size
- 26.4 × 51.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 24
- Pads
- 82
- Tracks, vias
- 122, 12
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Mar 2019
- Updated
- 25 Mar 2019
Overview
Din isolated SPI is an open-source printed circuit board by BitKnitting, from the BitKnitting/FitHome_Controller_PCB repository on GitHub. It is a 2-layer board of 26.4 × 51.2 mm with 16 parts on 24 nets, routed with 122 tracks and 12 vias.
It is built around the SI8661AB-B-IS1. Its parts include 10 resistors, 2 capacitors, 1 IC and 1 connector. It belongs with the radio and wireless boards of this library.
Main components
1README
README.mdTisham_PCB_Feather
The goal of this PCB is to supply a Feather to provide the CPU and networking.
SPI
The meter and CPU talk to each other using SPI. I just can't map SPI between CPUs and their slaves enough times not to get confused by the differing nomenclatures. Tisham's labeling of SPI used the SI/SO nomenclature on the slave (the meters) and MOSI/MISO on the master (the CPU). This maps to:
CS Pins
I plan to support Feather LoRa and Huzzah. This way, I can do either RFM95 or wifi.
Huzzah
Previously, I used pins 0 and 15 for the two CS pins. Here is the pinout diagram for the Huzzah:
The "0" and "15" refer to how the IDE (Arduino, CP) identify the pin. The "physical pin" for 0 is 12 and for 15 is 10. Because all of this confuses me quickly, I can best find these by noting:
- one CS pin - I'll id as CS 0 - is 5 pins up on the right. This is pin 0(IDE)/12(physical).
- one CS pin is 6 pins up on the right. This is pin 15(IDE)/10(physical). Tested both. I could set pin values to HIGH (3.3) and LOW (0.0).
LoRa
Here is the pinout diagram for the LoRa:
- The pin 5 pins up on the right is 9 (IDE) / 12 (physical) Hopefully this can also be CS 0
- The pin 6 pins up on the right is 10 (IDE) / 27 (physical). Tested both. I could set pin values to HIGH (3.3) and LOW (0.0).
3V3 In
Circuit Python
I keep getting different Feathers that need CP installed. Steps to install:
Huzzah
I'm conflicted if the Huzzah if Adafruit has dropped support for the Huzzah. The .bin is included in the latest releases. So I'm using that. You'll need the ampy and esptool tools installed.
- First thing to do is erase the flash on the ESP826. I like to start by naming the port, then erasing.
$ export PORT=/dev/tty.SLAB_USBtoUART
$ esptool.py -p $PORT erase_flash- Jumper GPIO0 and GND so the ESP826 is in boot mode.
- Write the bin you downloaded (I renamed my cphuzzah.bin)
esptool.py -p /dev/cu.SLAB_USBtoUART write_flash --flash_size=detect 0 cphuzzah.bin- Remove the jumper wire and hit the restart button.
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 47 | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R6, R7, R8, R9, R10, R12 |
| 2 | .1u | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 1 | ADAFRUIT_FEATHERWING_FitHome | HappyDayEnergyMonitor:ADAFRUIT_FEATHER | MS1 |
| 1 | CONN_01X10 | Connectors_Molex:Molex_MicroLatch-53253-1070_10x2.00mm_Straight | J1 |
| 1 | LOGO | Whatnick_logo:Whatnick_logo | G1 |
| 1 | SI8661AB-B-IS1 | Housings_SOIC:SOIC-16_3.9x9.9mm_Pitch1.27mm | U1 |
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Questions
How big is the Din isolated SPI PCB?
It measures 26.4 × 51.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Din isolated SPI use?
16 parts, built around the SI8661AB-B-IS1. 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.
Where can I download the Din isolated SPI KiCad files?
From the BitKnitting/FitHome_Controller_PCB repository on GitHub, at the commit this page was made from: the board is din_isolated_SPI.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Din isolated SPI design in my own project?
Its repository states no licence, so its author keeps all rights: ask BitKnitting before reusing the design.