Programmable industrial on-off timer with rf remote pdf

Presented here is a touch-control based home automation system that can control up to six electrical devices. It also has a separate keyboard interface module for troubleshooting and system settings.

This project is available at: Home automation system. This project is designed using normally-closed reed switches connected to doors and windows and additional passive infrared PIR motion sensors to detect movement of a burglar or an unwanted intruder in your home. The security system can dial up to two phone numbers to alert you.

It can also send text message to one of the numbers. The project is available at: Arduino based home security system. Automation systems are increasing in day to day life. Applications like home and industrial automation reduce man power while increasing the efficiency. Here in this project let us see how automated menu for ordering food in restaurants can happen. In these modern days the number of restaurants are increasing.

They also require very fast processing for serving food to the customers. With the increasing number of customers, it would require more man power, since the current situation has become hectic for the restaurants. This system was proposed using some simple electronic components. This project is available at: Restaurant menu ordering system. This project controls home electrical appliances using a touchscreen input device.

The system comprises two relays for controlling a bulb and a fan as an example. The touchscreen placed on a graphical LCD acts as a control panel for sending control commands through a pair of wireless radio frequency RF communication modules. Here we describe how to control electrical and electronic gadgets from a remote location using radio frequency RF transmission. Besides, RF has a longer range. The signal is transmitted by an RF transmitter and received by an RF receiver to switch on or switch off the desired device.

This system can be used to control up to fifteen devices. This project is available at: RF based multiple device control. Imagine a machine that can see and speak, and is fully portable. It is surprising, right? In this article, we present a system based on Raspberry Pi, or Raspi, that can see and speak. It takes pictures of text content around its vicinity from the webcam attached to Raspi, converts it to speech and speaks out the text through a headphone or speaker connected to its audio jack.

This project is available at: See and speak using raspberry pi. Presented here is a Windows based equipment controller project that can control up to eight electrical devices using a personal computer.

Connecting a computer to external devices is becoming essential in our day-to-day life for automation. But to communicate to a device we need a common communication protocol such as a serial COM port , USB or wireless connectivity. Here we have used the serial communication protocol to control the devices. This project is available at: PC based equipment controller.

In most of the modern manufacturing and processing industries, there is complete industrial automation through sophisticated hardware and software like programmable logic controller PLC , distributed control system DCS , and supervisory control and data acquisition SCADA.

Microcontroller-based embedded systems play significant role in industrial automation. One such widely used system is the programmable timer. Here is a microcontroller based wireless equipment controller that can switch on or switch off up to four devices at a desired time interval set by the user in the transmitter.

The devices can be controlled remotely up to 30 metres from the transmitter. In the transmitter, an LCD module is used to show the device numbers and pre-set control time for the devices 00 to 99 seconds. Relay RL 1 is used to switch on or off the appliance. The circuit diagram of power supply is shown in figure 4. These 12V output is changed to 12V DC using a bridge rectifier made from 4 general purpose rectifier diode D 1 to D 4 and a filter capacitor C 4.

Here we have described how the system operates. The properties and working of switches are listed below in table 1. Switch SW 7 is used to select the mode of operation i. Single mode or repeat mode. In single mode, the sequence of on and off time will run once but in repeat mode the sequence repeats. When an interruption is occurred during the operation, say when a switch is SW 7 is changed to single mode from repeat mode, the time stops only after cycle completes.

Time Increment time set by 1 sec. Time Decrement time set by 1 sec. SW 6 Control Selection Selection of either remote or keypad control. SW 7 Mode Selection Selection of either repeat or single control. One can select the desire time by pressing switch SW 2 for decreasing and SW 3 for increasing. As the time period expires, the timer will either trigger or shut the process. Earlier there were mechanical timers that used gear assembly same as wall clock and mechanical contacts.

But the problem with these was that due to mechanical parts and movements, they were not durable. Electronic timers have become very popular as these have more functionalities and long operating life. Also, in chain process where the end of first process starts second process and so on , one can use a number of such monostable blocks to make a sequential timer.

But these circuits do not include additional features like digital display, system failure indication, remote operation and alarms. Since the precision and accuracy of these timer circuits depend upon the value of the resistor-capacitor components that may deviate, we might not get the exact and precise timing. To enhance the programmable timer for generating precise timing and additional features, microcontrollers embedded controllers are used with peripheral devices.

Time set from 1 to 60 seconds can be extended 2. Repeat continuous and single operation 4. Fully remote-controlled within metre range 5. User-friendly front-panel controls and display panel with LCD 6. Emergency stop buttons on control panel as well as on remote 7. Circuit description The complete hardware circuit is divided into two sections—programmable timer main circuit and remote control transmitter and receiver units.

The main circuit is a fully-functional standalone unit with front-panel control switch and LCD display. Remote control transmitter and receiver are add-on units. The receiver outputs are connected with respective control input pins of main circuit. Receiver output facilitates user to program and control timer operation using remote within metre range. Main circuit. Switches S1 through S4 are connected to port pins P1.

Switch S6 selects for either remote or keypad control, and switch S7 selects control for either repeat or single mode operation. Port pin P3. Diode D5 acts as free-wheeling diode for relay RL1. Power-on reset is provided by the combination of resistor R1 and capacitor C3. Switch S5 is used for manual reset or emergency stop function. The transformer output is rectified by a full-wave rectifier comprising diodes D1 through D4, filtered by capacitor C4 and regulated by IC IC4.

Capacitor C5 bypasses the ripples present in the regulated supply. Assemble the circuit on a PCB as it minimises assembly time and errors. Carefully assemble the components and double-check for any overlooked error. The functions of all keys are given in Table I. The mode selection switch S7 selects either repeat or single mode. During this cycle if this switch is changed to single-mode, the timer stops as the cycle completes. Also, if the emergency stop ES button is pressed during any mode of operation the timer operation will stop.

The step-by-step operation when the main circuit is powered is as follows: 1. After that the relay is de-energised and the device turns off. If the timer is operating in the repeat mode the cycle will repeat continuously and device will be switched on and off after required time intervals. In this mode if the operation has to be stopped then either switch S7 has to be toggled or ES button has to be pressed 9.

If the timer is operating in single mode then as one on-off time cycle completes, the timer stops working. For remote control operation, port pins P1. Also, switch S6 connected to port pin P3. Remote control transmitter and receiver circuit. Transmitter circuit. Key S14 is directly connected between TE pin and ground as shown Fig.

LED3 is connected for indication of pressing the switch. Status of data along with 8-bit address is serially transmitted through ASK transmitter.