Tom's Life Bits

User Tools

Site Tools

Trace: • standard_lcd_4x20_march_2013 • sparkfun_arduino_pro_july_2011 • smart_remote_control
2016:huzzah_gpio

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
2016:huzzah_gpio [2016/08/08 10:59] – 192.168.1.12016:huzzah_gpio [2016/08/08 17:29] (current) – [I2C] 192.168.1.1
Line 7: Line 7:
   * *GPIO #15, is also used to detect boot-mode. It has a pulldown resistor connected to it, make sure this pin isn't pulled high on startup. You can always just use it as an output   * *GPIO #15, is also used to detect boot-mode. It has a pulldown resistor connected to it, make sure this pin isn't pulled high on startup. You can always just use it as an output
   * *GPIO #16 can be used to wake up out of deep-sleep mode, you'll need to connect it to the RESET pin   * *GPIO #16 can be used to wake up out of deep-sleep mode, you'll need to connect it to the RESET pin
 +
 +**Rev A of this board has GPIO #4 and #5 swapped (the modules changed pinouts on us) so if #4/#5 aren't working for you, try swapping! We'll fix in the next PCB run**\\
 +
 +NodeMCU has weird pin mapping.
 +Pin numbers written on the board itself do not correspond to ESP8266 GPIO pin numbers. We have constants defined to make using this board easier:\\
 +
 +  * static const uint8_t D0   = 16;
 +  * static const uint8_t D1   = 5;
 +  * static const uint8_t D2   = 4;
 +  * static const uint8_t D3   = 0;
 +  * static const uint8_t D4   = 2;
 +  * static const uint8_t D5   = 14;
 +  * static const uint8_t D6   = 12;
 +  * static const uint8_t D7   = 13;
 +  * static const uint8_t D8   = 15;
 +  * static const uint8_t D9   = 3;
 +  * static const uint8_t D10  = 1;
 +
 +
 +If you want to use NodeMCU pin 5, use D5 for pin number, and it will be translated to 'real' GPIO pin 14.\\
 +
 +===== I2C =====
 +The Huzzah does have I2C on it's interface.  Pinout is:
 +  * #4 = SDA
 +  * #5 = SCL
 +Verified to work on 8/8/2016 using DS3231 and Huzzah on proto board.\\
 +Must use the following include:\\
 +     #include <RtcDS3231.h>
 +which is in the library RTC by Makuna.\\
 +
 +SDA/SCL default to pins 4 & 5 but any two pins can be assigned as SDA/SCL using Wire.begin(SDA,SCL).\\
 +
2016/huzzah_gpio.1470668360.txt.gz · Last modified: 2016/08/08 10:59 by 192.168.1.1