Difference between revisions of "Status Boards"
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The driving of the 16 LEDs poses an interesting problem due to the limited number of digital outputs on the NodeMCU: we are looking for a simple low-cost solution so after looking at various ICs to perform the task I decided to throw in another inexpensive micro with plenty of I/O and control it with I2C, serial or similar. | The driving of the 16 LEDs poses an interesting problem due to the limited number of digital outputs on the NodeMCU: we are looking for a simple low-cost solution so after looking at various ICs to perform the task I decided to throw in another inexpensive micro with plenty of I/O and control it with I2C, serial or similar. | ||
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| + | == Using a cheap ProMicro for I/O == | ||
| + | |||
| + | The NodeMCU can tell the ProMicro what outputs to drive with a simple serial protocol: - | ||
| + | * ASCII for human convenience and same parsing code on both micros | ||
| + | * same interface on both UARTS - USB and HW for simplicity and testing | ||
| + | * The ESP8266-E is not 5v tolerant on the UART so I shall use a voltage divider | ||
| + | ** https://cdn-shop.adafruit.com/product-files/2471/0A-ESP8266__Datasheet__EN_v4.3.pdf | ||
Revision as of 13:05, 28 March 2016
Simple means of showing status of Hackspace stuff on web and physical boards.
- NodeMCU (ESP8226) with Arduino core for WiFi-enabled status board
- NodeJS server for HTTP access
- https://github.com/msemtd/nodemcu-statusboard
- Physical Prototype
First A4 lasercut prototype with 8 bits of data
The driving of the 16 LEDs poses an interesting problem due to the limited number of digital outputs on the NodeMCU: we are looking for a simple low-cost solution so after looking at various ICs to perform the task I decided to throw in another inexpensive micro with plenty of I/O and control it with I2C, serial or similar.
Using a cheap ProMicro for I/O
The NodeMCU can tell the ProMicro what outputs to drive with a simple serial protocol: -
- ASCII for human convenience and same parsing code on both micros
- same interface on both UARTS - USB and HW for simplicity and testing
- The ESP8266-E is not 5v tolerant on the UART so I shall use a voltage divider