- Simulate and synthesized by Vivado, clock frequency of FPGA board is 100 MHZ
- Data measured by sensor is passed to board by I2C, then stored on register
- 14-bit resolution of raw data is processed on board into human readable format
- Result is displayed on another smart device via UART communication protocol
Table below illustrates the module hierarchy of the project:
| Top Module | Major component | |||
|---|---|---|---|---|
| GPIO | → | Debouncer | ||
| → | UART_TX_CTRL | |||
| → | pmod_hygrometer | → | i2c_master | |
| → | Binary_to_BCD | |||
| --- Constraint--- | --- | --- | --- | --- |
| Arty_Master.xdc |
- ArtyA7 reference manual posted by Digilent
https://digilent.com/reference/programmable-logic/arty-a7/start?redirect=1 - Datasheet of Pmod HYGRO Digital Humidity and Temperature Sensor
https://digilent.com/shop/pmod-hygro-digital-humidity-and-temperature-sensor/ - Pmod interface specification
https://digilent.com/reference/_media/reference/pmod/digilent-pmod-interface-specification.pdf - TI HDC1080 Low Power, High Accuracy Digital Humidity Sensor with Temperature Sensor
https://www.ti.com/lit/ds/symlink/hdc1080.pdf - GPIO driver in VHDL
https://github.com/Digilent/Arty-A7-100-GPIO/tree/master/src/hdl - UART_TX communication protocol in VHDL
https://github.com/Digilent/Arty-A7-100-GPIO/blob/master/src/hdl/UART_TX_CTRL.vhd - Pmod HYGRO sensor driver in VHDL
https://forum.digikey.com/t/humidity-and-temperature-sensor-pmod-controller-vhdl/13064 - Binary to BCD module in VHDL, includes integer part only
https://www.nandland.com/vhdl/modules/double-dabble.html - STL_LOGIC_VECTOR to ASCII in VHDL
http://computer-programming-forum.com/42-vhdl/838e970e310e791c.htm - String to ASCII in VHDL
https://stackoverflow.com/questions/22900938/vhdl-is-there-a-convenient-way-to-assign-ascii-values-to-std-logic-vector