Atmel AT89C2051 Single Chip Microprocessor Circuit

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Notes :
* This is a actual simple appliance of a distinct dent chip (IC1).

* The array ability accumulation is affiliated on terminals T1 &T2. While the ambit diagram specifies 3v/4.5v battery, the allotment ULN2803 needs 4.5v-5v array to get able operation.

* About-face SW2 allows the PCB to be angry on and off.

* Capacitor C1 provides a displace arresting to the microprocessor.

* XTAL1 provides the oscillator timing basic for the microprocessor. It is important to use a clear for XTAL1, not a bowl resonator – ancestor testing shows that a bowl resonator gives problems unless capacitors to arena are placed on X1 & X2.

* Diode D1 provides some aegis for the chip in case of transients or mis-connection of the battery

* Optodarlington TR1 is the ablaze sensor

* Pot VR1, as labelled, adjusts the acuteness of the ablaze sensor

* Resistor R9 provides accepted attached back abounding beam is on TR1 at max sensitivity

* TR2 is a about-face acclimated to faculty beam (On=TR1 illuminated)

* Pin 6 of the micro is the LiteOn ascribe (Low=TR1 illuminated)

* SW1 is in alongside with the LiteOn ascribe – blame SW1 is like anecdotic TR1

* Resistors R12 & R13 cull up the accessible beneficiary outputs P1.0 and P1.1 of IC1

* IC2 is the disciplinarian IC, with several hundred milliamps drive adequacy on anniversary output

* R1-R8 absolute the accepted that can be taken from anniversary achievement of IC2, and are best advantageous back LEDs are affiliated anon to pins L1-L8. If added accessories are used, such as relays, the ethics may of R1-R8 may accept to be changed, or replaced with links.

* R10 banned the accepted from IC1 into the abject of TR3

* TR3 is a about-face transistor that drives the sounder achievement (P3.7 Low=Sounder apprenticed high)

* R11 provides the chic A amount resistor for the sounder output

* C2 Capacitively couples the apostle to TR3 and R11.

* C3 provides some accumulation decoupling.

* The attribute PCB LAM#1 is a almanac of the PCB coat ID number, and ensures the PCB coat appears in the genitalia list

* The attribute SKT1 is a almanac of the charge for a atrium for IC1, and ensures that the atrium appears in the genitalia account

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