SI7013EVB-UDP-M3L1 Datasheet, PDF (10/26 Pages) Silicon Laboratories – Si7013EVB-UDP-M3L1 Users Guide

Si7013EVB-UDP-M3L1
4.7. Data Logger
The Si70xx Data Logger demonstrates how the SiM3L1xx microcontroller unit (MCU) and the Si7013 sensor can
be used to record temperature and humidity over an extended period of time. This project includes Data Logger
firmware that runs on a SiM3L1xx MCU card (UDP SIM3L1XX-LCD MCU) and a Data Logger application that runs
on a PC. The Data Logger firmware reads the temperature and humidity from the Si7013 port header card
(Si7013EB-UDP), which is plugged into the MCU card, and stores the samples in the MCU’s flash memory. The
flash memory can store up to 8192 samples. The Data Logger application displays the samples on a graph.
4.7.1. Installing the Data Logger
There are three steps required to install the Data Logger:
1. Install the Data Logger firmware on the MCU card.
2. Install CP210x drivers on the PC.
3. Install the Data Logger application on the PC.
4.7.1.1. Installing the Data Logger Firmware
The “Si7013 UDP SiM3L1xx Evaluation Board Documentation and Software” CD contains the source code for the
Data Logger firmware. However, you do not need to build the Data Logger firmware, because the CD also contains
a pre-built image file and a batch file to download the image file to the MCU card. This is done using the following
procedure:
1. Plug the Si7013 port header card onto J21 (PB0) of the MCU card. The Silicon Labs logo on the port
header card faces the power connector on the MCU card. Make sure that the VIO pin on the port header
card matches up with the VIO pin on J21. The top 4 pins (1-4) of the port header card do not connect with
J21.
2. Connect the USB Debug Adapter to a USB port on the PC and connect the USB Debug Adapter to the
debug connector (J14) on the MCU card.
3. Connect the power supply to the MCU board (J6).
4. Verify that the switches on MCU card are set correctly:
Table 3. MCU Card Switch Settings
Switch Label
VBAT Sel
VIORF Sel
Number
Setting
SW2 +3.3 V_VREG (center)
SW9
VBAT (down)
VIO Sel
SW8
VBAT (down)
5. Open Windows Explorer and change to the project folder:
\UDP_Software_vX.X\DataLogger\FW\SiM3L1xx\ (where vX.X is the version number of the UDP
software).
6. Double click on the “Install_Si70xx.bat” file in the project folder. This opens a command window and
downloads the pre-built image file (UDP_DataLogger_Si70xx.hex) to the MCU card.
7. Verify that “Success. No errors reported.” is displayed in the command window.
8. Press any key to close the command window.
Initially, the MCU board is in low-power “sleep” mode. In sleep mode, the LCD is blank, and the S1-S3 buttons do
not work. To wake up the MCU board, press down on the center joystick button. When the MCU board is awake,
the Data Logger firmware displays temperature and humidity on the LCD. The LCD is updated every two minutes
with new temperature and humidity readings. If you prefer the temperature to be displayed in Fahrenheit, then
press the S2 button. If no button is pressed within 15 seconds, the MCU board goes back to sleep.
The Data Logger firmware is now installed on the MCU card and the USB Debug Adapter is no longer needed.
Disconnect the USB Debug Adapter from the debug connector on the MCU card.
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