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August 31, by Nick Davis This project uses a C microcontroller development kit, an accelerometer evaluation board, and Simplicity Studio IDE—all dataeheet Silicon Labs—to rather quickly and easily build a motion-detecting alarm dxtasheet. This kit comes with the CF microcontroller installed—see Figure 1 below. The audio piezo alarm chosen for this project is a slow warble alarm with a resonant frequency range of to Hz.
Given its relatively small size, this bugger generates an ear piercing sound of dB at cm with a drive voltage of 12V.
This alarm has its own internally driven circuitry and operates from 5V to 15V, which is perfect for this project because we have 12V readily available. Just apply the voltage and you’re off and running—no worrying about feeding the alarm a PWM signal for the warble effect. Also, they’re convenient components for this 12V system because they operate from a 12V supply.
After receiving the interrupt signal, the microcontroller then turns on two external FETs thereby energizing both the audio alarm and the two LED flood lights. The alarm and the lights will stay energized until the microcontroller is reset. Figure 7 below depicts the connections between the various components.
CFGM 8-bit Microcontroller – Silicon Labs
The 4-wire SPI connection between the accelerometer and the microcontroller is also shown. If not, then type “CF” in the product field on the left-hand side of the screen. The CF Development Kit should become visible as an option—click on this option see Figure 8 below. See Figure 9 below. Datashest the Project Configuration screen, leave everything as is see Figure 9 below then click Finish. The code is well commented.
CFTB Silicon Laboratories Inc, CFTB Datasheet
During the development of this project I got hung up on the Clock Phase and Clock Pulse configurations. Although not clearly called out in the accelerometer datasheet, they are mentioned. However, instead of referencing “Clock Phase” and “Clock Polarity”—which seems to be the norm see section It is stopped high when CS is high no transmission.
In reality, this issue had me stumped before I resorted to utilizing an SPI bus analyzer. Figure 10 below is a screen shot of said analyzer with the correct configuration. Once you have completed the configuration changes to the microcontroller, you’ll have to add all the code to correctly configure the accelerometer. The code excerpt below shows the necessary code changes. As can be seen, I have configured register 0x20 in such a way that only the X and Y axes are enabled.
Register 0x32 sets the acceleration threshold set to mg for when the Int1 signal is driven; the mg threshold setting is what makes the motion detector datadheet sensitive to slight accelerations. Be sure to have the accelerometer on a fairly level surface. After you run the code, lightly tapping the accelerometer evaluation board or the breadboard should sound the alarm and turn on the two LED flood lights.
In the video demonstration below, you can see that tapping the breadboard triggers the alarm, and pressing the development board’s reset button re-arms the system. If you decide to use this accelerometer in a dataasheet design—sans the development and evaluation boards—you’ll want to use the LIS2DH accelerometer device itself on your new PCB design.
Build Your Own Motion Detection System Using an Accelerometer
Be sure to pay close c80051f930 to the part’s layout requirements as this device is quite small, with its pads being much, much smaller. Give this project a try for yourself! This project uses a C microcontroller development kit, an accelerometer evaluation board, and Simplicity Studio IDE—all from Silicon Labs—to rather quickly and easily build a motion-detecting alarm system.
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User guide Quick-start guide CF datasheet Note: Evaluation board datasheet Device datasheet. LED flood light qty 2.