Showing posts with label Relay and delay. Show all posts
Showing posts with label Relay and delay. Show all posts

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digital clock / calendar / thermometer

Sunday, September 5, 2010 by sms


Here is a finely made digital clock with calendar and thermometer.

It is based on Microchip PIC16F628 (or PIC16F84) microcontroller and DS18S20 or DS18B20 temperature sensor from Maxim-IC. The hardware is pretty easy because it contains only a PIC microcontroller, DS18S20/DS18B20 sensor, 4x7 segment LED display with common anode, four 2N3906 transistors and several resistors.

The project site can also be found and the project: a digital thermostat.

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Time Delay Relay Schematic

Friday, May 21, 2010 by sms

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use.
Time Delay Relay Schematic
Schematic



Parts

Part
Total Qty.
Description
Substitutions
R1 1 1 Meg Pot
R2 1 10 K 1/4 Watt Resistor
C1 1 10uf 25V Electrolytic Capacitor
C2 1 0.01uf Ceramic Disc Capacitor
D1,D2 2 1N914 Diodes
U1 1 555 Timer IC
RELAY 1 9V Relay
S1 1 1A 120V SPST Switch
MISC 1 Board, Wire, Socket For U1

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Rangkaian Delay Dan Relay

by sms

Some relays are complete with a affectionate of "shock absorber" apparatus absorbed to the armature which prevents immediate, abounding motion back the braid is either activated or de-energized. This accession gives the broadcast the acreage of time-delay actuation. Time-delay relays can be complete to adjournment armature motion on braid energization, de-energization, or both.
Time-delay broadcast contacts charge be defined not alone as either normally-open or normally-closed, but whether the adjournment operates in the administration of closing or in the administration of opening. The afterward is a description of the four basal types of time-delay broadcast contacts.First we accept the normally-open,
Rangkaian Delay Dan Relay
Rangkaian Delay Dan Relay

timed-closed (NOTC) contact. This blazon of acquaintance is commonly accessible back the braid is unpowered (de-energized). The acquaintance is bankrupt by the appliance of ability to the broadcast coil, but alone afterwards the braid has been continuously powered for the defined bulk of time. In added words, the administration of the contact's motion (either to abutting or to open) is identical to a approved NO contact, but there is a adjournment in closing direction. Because the adjournment occurs in the administration of braid energization, this blazon of acquaintance is alternatively accepted as a normally-open, on-delay:

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