Witura WT-9001 IP65 Specifikace stáhnout pdf (Strana 36)

2.2.2.4 Circuit Operation

To clearly understand the operation of the circuit in GSM-Relay, the circuit

diagram attached at Figure. Refer to the Figure there are several very important part in

the GSM-Relay process [2]. Between the processes included in this device are:

a) DTMF Decoder = Using IC MT8870B

b) CPU Microcontroller = Using PIC 16F872

c) Alarm Option

d) Power Supply = Using IC 7805

e) Relay Driver = Using ULN2004

f) Temperature Sensor = Using LM335z

Figure 2.15 Circuit Diagram GSM-Relay 2009 Probyte

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 81 82

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Witura WT-9001 IP65 Specifikace Strana 36