MCU controlled Bluetooth automation with infrared sensor The
microcontroller used is 0822 zilog encore! 8k
series (soic,28pin) as shown on the figure. Is a
programmable microcontroller, the functions used
are the GPIO and the UART of the chip. GPIO is
used on led indicators, and the UART is used for
giving and reading AT COMMANDS to control the
MCU controlled Bluetooth automation with infrared sensor
The microcontroller used is 0822 zilog encore! 8k series (soic,28pin) as shown on the figure. Is a programmable microcontroller, the functions used are the GPIO and the UART of the chip. GPIO is used on led indicators, and the UART is used for giving and reading AT COMMANDS to control the Bluetooth device.
The controller board consists of the Bluetooth device, 0822 zilog encore, the max232 IC for programming, DB9 connector and some components, this board has a built in programmer, so it can be re-programmed any time the user wants to.
D9 and D10 is used to indicate connectivity from the other Bluetooth module(the remote device), it should be in the on condition. If it is not, the reset button can be pressed to make a new connection to the remote device. The max232 IC from maxim, is connected to a switch(DPDT, to make it much more cheaper), for either programming or serial communications in the hyperterminal of the PC. D1-D4 is used to indicate the switch status. D5-D9 is optional, it can be used to indicate the status of the load in the remote device, so the programming will be that easy. The power supply of the controller board consists of 3.1265 volts(LM317) and the LM7805 ic. Vout of the LM317 IC can be achieved by the formula:
Controller board (1st board)
The main function of the remote device is to accept commands from the BTSerial1, or the controller board, via Bluetooth communications. This will turn ON/OFF the loads that is connected to the relays.
The whole schematic is included in the rar file, so it
will be easy for the others to see the whole schematics.
A shot of the whole circuitry of the remote device which includes buzzer, the power supply, the remote device board and the relay drivers for high voltage loads.
The function of this relay board is to switch the high voltage loads(220volts), from low voltage signals.. this is connected to the remote device board
The front panel, with 12volts relay to switch high voltage loads.
Infrared is on, not visible to the human eye
With the buzzer
The circuit of the op-amp, using a simple comparator. To drive a relay, which will also drive the 12volts buzzer. buzzer The infrared switch can be used as an alarm to intruders at home. The process of the whole circuit is like a simple switch, but uses infrared, that, If the signal from the infrared transmitter is blocked, the buzzer will turn on, this will serve as a simple alarm that can have many useful applications. The whole circuit components are soldered directly, without PCB.
Screen shot of the remote device. Consists of the 3 power supply: 3volts, 5volts and 12volts, which is supplied to the BTSerial2 (Bluetooth device on the remote device), the 5volts relays, and the 12volts relays, ULN2803 are also used as a buffer to amplify low signal to trigger to a high level, it also consists of LED indicators, to indicate status.
This is the Bluetooth pair device that is used, it has
10 GPIO, which can be configured as input or output, it
can be configured at the hyperterminal, in pass thru and
command mode. Supply voltage is from 3.0-3.3 volts. It
accepts AT COMANDS, and can be controlled also by any
microcontroller which has the function UART.
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