Digital Adjustable Delay Timer Kit 109

Digital Adjustable Delay Timer Kit 109

Introduction

Welcome to the exciting world of Circuit Creations electronics kits. To assemble this kit you will need the following basic items- 25W to 40W soldering iron, rosin core flux solder, diagonal cutters to trim excess lead length after soldering, and needle nose pliers for lead bending.

The central component of this kit is the PIC16F1826 microcontroller. The extensive capabilities of this microcontroller have been pre-programmed to provide a timer with digital delay adjustment. This kit is a great building block for projects to create a time delayed switch, use in automobile for delayed lighting or wipers, as part of a gaming application, camera timer, on/off timing for appliances… Your imagination is the limit for what can be done with this kit.

Digital Adjustable Delay Timer K109 Features

Circuit Assembly

The assembly instructions for the components that are included with Kit 109 are as follows:

Not all component locations on the PCB have components installed for this kit and are “Not Used”.

See www.circuitcreations.com for general assembly helpful hints.

Operation

Connect a DC voltage, such as a power supply, battery, or Circuit Creations Power Supply Kit 101, between 3 Volts to 12 Volts to the VIN and GND inputs of J1.

The timer value is set by the Switch S1 Settings 1 to 8 as listed in TABLE 2 and TABLE 3 below.

There are 4 active outputs for this circuit.

TABLE 1 – Circuit Output Descriptions

Switch position 1 and 2 of S1 determines the basic units of the delay timer.

TABLE 2 – Timer Basic Units Mode Description

The components of the circuit operate over a temperature range of 0C to 60C (32F to 140F). No calibration is required for the K109 digital adjustable delay timer kit. When the push button is pressed the timer interval will begin. An electronic trigger that goes from 2.5V to 0V connected to the RA0 pad will also activate the timer. The minimum trigger width is 5mS and the maximum is 100mS less than the selected time interval for both the push button and electronic trigger. Changing the switch S1 settings will only take affect when no delay timer interval is active (i.e. the LED is off).

The PCB for this kit has been designed to allow for flexibility and experimentation. All of the pins of the microcontroller are accessible by through-hole pads on the edge of the PCB allowing integration into your project. A prototyping area with 40 available through-hole pads on 0.1 inch centers and an array of 119 surface mount pads spaced for common device packages including access to VDD and GND is provided for your own circuit design additions. ENJOY!!

Schematic

Switch S1 Settings

TABLE 3 – Switch S1 Settings

Example switch settings:

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