Larger 4 digit Serial 7 Segment display which has capability of communicating through SPI / I2C / serial TTL inputs. Smaller version is basic display board with 0.56" display and LEDs for colon and Apos. Larger board is based on same basic design but it adds ports for DS1307/DS3132 RTC boards, ESP8266-01 or 12E/F, DHT11/22 enviromental sensor, LDR light sensor and extra status LED's. Unused pins f...
USB dongle Real time clock For raspberry Pi (which does not have one)
Initializes as a USB Serial port when plugged in to any computer and times can be read and set via serial commands
Microchip XC8 Project attached below
PCB Shown is revision 3 as I have been trying to fit it into a small USB dongle enclosure, the one it seems to fit best is the USB-7201-G from Bud Industries.
**Frequency divider 1/3600**
Will be used together with DS1307 RTC module to generate hourly pulse (from SQW/OUT configured to 1 Hz tick).
DS1307 should run on VBAT only, divider module will run on 3.3V.
Falling edge of pulse will be used to wake-up Atmel MCU from deep-sleep...