AVT 3200

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AVT 3200 Timer 0…99 minutes

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Timer 0…99 minutes

A simple timer to count down in time ranges from 0 to 99 seconds or from 0 to 99 minutes. Thanks to the built-in high current relay contact and intuitive operation, the timer can be used to perform time functions in home automation and industrial automation.

Specifications • 2 operating modes: seconds and minutes • time setting in the range of 1-99 in steps of 1 • output relay with contacts 230V AC, 8A • 2-digits LED display • power supply: 12V DC

Functional description Schematic of the timer is shown in Figure 1. Timer is supplied with DC voltage from 8...12 V. Rectifying diode D1 protects the circuit from reverse polarity. The supply voltage is stabilized by the integrated stabilizer U1. Timer is based on ATtiny261 microcontroller clocked with an internal RC generator. The operating status is displayed on a seven-segment display with a common anode. The 2-digit LED segments of the multiplexed LED display are connected via R5...R12 limit resistors to the PA0...PA7 pins of

the microcontroller. The T1 and T2 transistors are used to supply LED digits. Transistors are switch on/turned off by the signals from PB3 and PB4 pins of the microcontroller. Three buttons S1-S3 allow you to enter settings and enable timer functions. Buttons are connected to pins PB0, PB1 and PB6. Active level is low. The NO and NC contacts of the relay are connected to the pins of the output connector.

DIFFICULTY LEVEL

1

U1 7805

ZAS

1N4007

GND

C1 100uF

MIN/SEK 3 2 1

C4 100nF

SV1

+5V

VI

+

AVT 3200

3

VO GND 2

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

1 +

+12V

D1

C3 100nF

C2 100uF GND +5V

+5V +5V CFG

A1

T1 BC557

A2

VA1

T2 BC557 VA2

GND

VA1` SW1` SW2` B` DP` E` D`

C` A` G` F` VA2` SW3` GND`

A` B` C` D` E` F` G`

A` B` C` D` E` F` G`

16 15 3 2 1 18 17

a b c d e f g

11 10 8 6 5 12 7

a b c d e f g

LED1DIG1 COM

14 VA1`

4 3

S1

2 1

DP LED1DIG2 COM

4

DP`

13 VA2`

4 3

9

DP`

S2

2 1

4 3

DP

SW1`

2 1

SW2`

S3 SW3` GND`

U2

4x10k (ADC10/RESET)PB7 (ADC9/INT0/T0)PB6 (ADC8/XTAL2)PB5 (ADC7/XTAL1)PB4 (OC1B)PB3 (SCK/SCL/OC1B)PB2 (MISO/DO/OC1A)PB1 (MOSI/DI/SDA/OC1A)PB0


+5V

DIFFICULTY LEVEL

5 15

C5 100nF GND

VCC AVCC

6 GND 16 GND

(ADC6/AIN1)PA7 (ADC5/AIN0)PA6 (ADC4)PA5 (ADC3)PA4 (AREF)PA3 (ADC2)PA2 (ADC1)PA1 (ADC0)PA0

ATTINY26P

10 9 8 7 4 3 2 1 11 12 13 14 17 18 19 20

+5V SW3 OUT A2 A1 CFG SW2 SW1

R1 R4 R3 R2

F G A C D E DP B

R12 R11 R10 R9 R8 R7 R6 R5

+12V

SV2 VA1 SW1 SW2 B DP E D GND GND C A G F VA2 SW3 GND

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

1 PK1

D2 1N4007

2 NO OUT

T3 BC548 GND

PK1

NC

8x100

Figure 1. Schematic diagram

Assembly and test The assembly is easy and typical. At the start, you must install the smallest components and finish on the largest ones. After assembling, both plates should be connected using an angular goldpin connector. The assembled system works flawlessly when the power is turned on. For heavy load control, pay attention to the load on the relay contacts and the PCB paths. In order to improve the load capacity of the tracks, they can be soldered to thick copper wire. The time unit (seconds or minutes) is selected by the MIN/SEK jumper. The S1 and S2 buttons increase or decrease the time. Use the S3 button to start the timer. Each press of S2 button increases and S1 button decreases the time value. To make the change faster, press and hold the corresponding button. The set value is stored in the nonvolatile memory. If the dot is lit at the unity number, the timer counts down the minutes. If the dot is off, then the timer counts the seconds. Blinking a dot indicates time running.

When you start the timer, at any time by pressing S3 user can stop the timer. In this case the digits on the display will blink. The timer waits for a short press of the S3 key or its longer hold time, after which it will restart. Warning! Counting the time may be a little inaccurate, especially for minute work.

Start off by soldering the printed circuit elements in order from smallest to largest. The unit assembled flawlessly, using the supplied components will operate immediately after switching on the power supply.

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Component list

D1 D2

C1 C2

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AVT 3200

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Resistors: R1 - R4: ..................10kΩ (brown-black-orange-gold) R5 - R12:................100Ω (brown-black-brown-gold) Capacitors: C1, C2: ....................100µF ! C3 - C5: ..................100nF(also marked as 104) Semiconductors: D1, D2: ...................1N4007 ! U1: ...........................78L05 ! U2: ...........................ATtiny261 with 20-pin IC socket T1, T2: .....................BC557 (BC558) ! T3: ............................BC547 (BC557) ! DISP:........................LED-AF5624 Others: PK1: .........................relay SV1: .........................goldpin connector 1×16pin MIN/SEK: ...............goldpin connector 1×3pin+ jumper ZAS, NO, NC:........2-pin terminal block connector

While assembling the components marked with an exclamation mark attention should be paid to their polarity. Symbols of the components on the PCB as well as photos of assembled sets may come in useful. To access highresolution images, download the PDF file.

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U1 T1 T2 T3

C A

U2

1

1

2

Solder resistors R1-R16 and diodes D1, D2

ZOOM

4

Solder capacitors C2, C4, C5, transistors T1-T3, IC socket, voltage stabilizer U1 and goldpin 1×3

ZOOM

Solder LED display with PCB, insert jumper and insert chip into socket

3

Solder capacitors C1, C2, connector and relay Solder LED display, switch and goldpin connector

DIFFICULTY LEVEL

ZOOM

ZOOM


Assembly in 4 steps

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3

AVT 3200

Adjustable time 1 sec - 99 min


Figure 2. Relay on countdown timer

Adjustable time 1 sec - 99 min

Figure 3. Relay off countdown time

Thank you for purchasing AVT product. Please take your time to read carefully the important information below concering use of this product.

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Educational Electronics Kits are intended for educational and demonstration purposes only. They are not intended for use in commercial applications. If they are used in such applications the purchaser assumes all responsibility for ensuring compliance with all local laws. In addition, they cannot be used as a part of life support systems, or systems that for use as or as a part of life support systems, or systems that might create a hazardous situation of any kind.

• Battery or wall-adaptor are safe devices. They do not require special attention unless main voltage is connected to an output e.g. a relay. • If the kit is used to switch currents greater than 24V it is necessary to have the installation and performed by a trained professional authorized for such work. The kit may only be used in such application if it was installed in a safe to touch enclosure. • Never exceed the limits or ratings listed in the 'Specifications' section at the this user guide. • If the kit is used in schools or educational facilities or similar institutions the operation must be supervised by trained and authorized staff. • The product itself and all parts thereof (including packing material) are not suitable toys for childern! (choking hazard, risk of electric shock, ...) Failures in modern electronic component are very rare as 95% of non-working kits are due to poor soldering or components placed in the wrong location or orientation so please check your work carefully. If you require help, please contact our support team by email: [email protected]

DIFFICULTY LEVEL

AVT Korporacja sp. z o.o. ul. Leszczynowa 11, 03-197 Warsaw, Poland sklep.avt.pl

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This symbol means do not dispose of your product with your other household waste. Instead, you should protect human health and the environment by handing over your waste equipment to a designated collection point for the recycling of waste electrical and electronic equipment.

AVT Korporacja reserves the right to make changes without prior notice. Assembly and connection of the device not in accordance with the instructions, unauthorized modification of components and any structural modifications may cause damage to the device and endanger the person using it. In this case, the manufacturer and its authorized representatives shall not be liable for any damages arising directly or indirectly from the use or malfunction of the product.