- About
- Brief information about Pmod HYGRO
- Modules
- Interface Description
- Utilization
- Simulation
- Test
- Status Information
- Issues
- Licence
Simple interface for the Digilent Pmod HYGRO. This interface uses simplified version of my i²c master module.
The Digilent Pmod HYGRO contains a Texas Instruments HDC1080 digital humidity and temperature sensor. Module communicates with the host board via I²C protocol.
Two modules were implemented.
Module hygro_lite can be used to gather sensor readings using default configurations.
In module hygro, sensor configurations can be changed. Both modules use same ports, hygro having more ports to control configurations.
This interface can be used to gather data from Pmod HYGRO (or any other HDC1080) easily.
hygro_lite:
| Port | Type | Width | Description |
|---|---|---|---|
clk |
I | 1 | System Clock |
rst |
I | 1 | System Reset |
i2c_2clk |
I | 1 | I²C clock Source (max. 800 kHz) |
measure |
I | 1 | Initiate a new measurement |
newData |
O | 1 | Pulse to indicate new data available |
i2c_busy |
O | 1 | I²C Bus is busy |
dataUpdating |
O | 1 | Data registers are being updated |
sensNR |
O | 1 | Sensor is not responding |
tem |
O | 14 | Most recent temperature reading |
hum |
O | 14 | Most recent humidity reading |
SCL |
O | 1 | I²C clock |
SDA |
IO | 1 | I²C data |
I: Input O: Output
hygro:
| Port | Type | Width | Description |
|---|---|---|---|
clk |
I | 1 | System Clock |
rst |
I | 1 | System Reset |
i2c_2clk |
I | 1 | I²C clock Source (max. 800 kHz) |
measureT |
I | 1 | Initiate a new Temperature measurement |
measureH |
I | 1 | Initiate a new Humidity measurement |
newData |
O | 1 | Pulse to indicate new data available |
dataUpdating |
O | 1 | Data registers are being updated |
sensNR |
O | 1 | Sensor is not responding |
tem |
O | 14 | Most recent temperature reading |
hum |
O | 14 | Most recent humidity reading |
SCL* |
IO | 1 | I²C clock |
SDA* |
IO | 1 | I²C data |
heater |
I | 1 | Heater |
acMode |
I | 1 | Acquisition Mode |
TRes |
I | 1 | Temperature Measurement Resolution |
HRes |
I | 2 | Humidity Measurement Resolution |
swRst |
I | 1 | Software Reset |
I: Input O: Output
* contain pins _i, _o and _t
I²C clock source, i2c_2clk, should be generated externally. Module clockGen_i2c can be used to generate 781,25 kHz I²C clock source (390,62 kHz I²C clock).
| Module | Slice LUTs as Logic | Slice Registers as FF | Slice Registers as Latch |
|---|---|---|---|
hygro_lite |
50 | 55 | 1 |
hygro |
62 | 69 | 0 |
clockGen_i2c |
7 | 7 | 0 |
Module hygro is simulated in fullsim.v. SCL connected to pullup and SDA connected to pulldown.
hygro_lite
Module hygro_lite is tested on Digilent Basys 3 with test_board.v and Basys3_lite.xdc. Right button used to initiate new measurement. Measurement results with 2 extra 0s at LSBs shown on seven segment displays. Rightmost switch used to switch between temperature and humidity reading. Pmod HYGRO connected to upper JB and; newData, i2c_busy and dataUpdating signals connected to JA. sensNR signal connected to rightmost LED. I²C, newData, i2c_busy and dataUpdating signals are monitored with Digital Discovery.
hygro
Module hygro is tested on Digilent Basys 3 with testboard_full.v and Basys3_full.xdc. Right and left buttons used to initiate new Temperature/Humidity measurements. Upper button does software reset. Leftmost switches are used for configurations. Rightmost switch used to switch between temperature and humidity reading. Pmod HYGRO connected to upper JB and; newData and dataUpdating signals connected to JA. sensNR signal connected to rightmost LED. I²C signals are monitored with Digital Discovery.
Last test of hygro_lite: 2 January 2021, on Digilent Basys 3.
Last simulation of hygro: 3 Fabruary 2021, with Vivado Simulator.
Last test of hygro: 3 Fabruary 2021, on Digilent Basys 3.
- In
hygro: Changing measurement resolutions doesn't seem to work, even though I²C transmission looks correct.
CERN Open Hardware Licence Version 2 - Weakly Reciprocal