![]() ![]() An LCD is connected to the microcontroller through Data pin D 0 to D 7 as shown in the figure. It includes a microcontroller AT89C51, an LCD, and a few other electronic components like resistors, capacitors, transistors,s, etc. The circuit diagram of the control section is shown in figure 3. The output pin of RF receiver RX 1 (pin 2) is connected to the DIN pin (pin 14) of IC 2.Ĭontrol Section | Industrial Timer Circuit Here we used a series connector to get a 51K-ohm resistor. Two resistors R 4 and R 5 are connected between oscillator pins (pin 15 and pin 16). LED 2 is used to indicate the reception of data from the transmitter. The output of AND gate IC is connected to the reset pin through the ON/OFF switch SW 9. The data pin of IC 2 is connected to the microcontroller through a 4PDT switch SW 8 and connected to the input of the 4-input AND gate IC (IC 3) as shown in figure 2. Al the address pin of IC 2 is connected to the ground to set address ‘00h’ as in the transmitter section. It includes decoder IC HT12D (IC 2), RF receiver module, and 4-input NAND gate IC. The circuit diagram of the receiver section is shown in figure 2. Receiver Section | Industrial Timer Circuit receiver section and the control section. Pin no 14 (TE) pin is connected directly to the ground through switch SW 14.įor less complexity, we further divided the control circuit into two main sections i.e. Where LED (LED 3) is used to indicate whether the switch is pressed or not. The function of the keys is listed in table 1. Four push-to-on switches (switch SW 10 to SW 13) are connected to the data input pin through diodes. The data pin of the RF transmitter is connected to D out pin (pin 17) where a 1 M resistor is connected to the oscillator pin (pin 15 and 16) of IC 5. To set address ‘00h’ all the address pins of IC 5 are connected to the ground as shown in the circuit diagram. The entire circuit is built around encoding IC HT12E (IC 5) and 433 MHz radio frequency transmitter module with some other electronic components for working flawlessly. ![]() The circuit diagram of the transmitter section is shown in figure 1. ![]() Transmitter Section | Industrial Timer Circuit Here at first let’s discuss the transmitter section. The circuit of “Industrial Timer Circuit” is divided into two main sections i.e. Digital Clock with Seconds and Alarm Time DisplayĬircuit Description of the industrial timer circuit.24 Hour Digital Clock and Timer Circuit.Sound Activated 0-30 Minutes Timer Circuit.An emergency stops buttons to avoid any unusual operation in both the control panel as well as in the transmitter circuit.Ĭheck out other interesting timer projects posted on.For a better user interface, an LCD with front-panel control is available.Wireless remote facility with a range of 100m.A facility like single or continuous mode is available.On/Off time is programmable thus one can program time from 1 to 60 seconds.1 to 60 seconds can be set which can be extended by editing software code.Initialization and switching process after desired or predefined time with delay facility.The above-listed limitation can be overcome using the project “Industrial Timer Circuit”.īefore starting a discussion on circuit description and working, here we have listed some features of the Industrial Timer Circuit. These types of circuits have various types of limitations like digital display, an indication of system failure, remote (wireless operation), alarm, etc. A simple timer circuit can be designed using 555 timer IC by configuring it into monostable mode. ![]()
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