Avt 1881 User manual

Specifications

• number of programme steps: 124

• very simple programming of lighting effects

• load capacity: 200 mA / channel

The controller is equipped with eight outputs to

directly control of light emitting diodes or relays,

through which they can then switch on any high-

power equipment. The light sequences are not

imposed - each user programs them independently. It

is possible to program a sequence consisting of 124

steps maximum. This programme is stored in non-

volatile EEPROM memory of the microcontroller. It is

possible to play a recorded sequence once or to play

it in a loop. Playback speed can be adjusted by

pressing two buttons in 27 steps from 0.05 second up

to 30 seconds/step.

e.g., LEDs or relays

• eight outputs to control light sources

• UP/DOWN keys to adjust the speed of change

• supply: 12 VDC

• control of various types of output systems,

• operating status indication: LED

playback

Electrical diagram of the controller is shown in

Figure 1. Operation of the circuit is controlled by a

microcontroller ATtiny2313 timed by an internal

clock signal . The controller must be supplied with

a voltage of 12 V DC connected to the VCC

connector. The D1 diode protects the circuit from

incorrect polarity of the input voltage. The U1

stabiliser provides the +5 V voltage, while the C1-

C4 components filter it. As an output amplifier for

the individual controller channels, the ULN2803A

chip was used, which contains 8 transistor amplifier

stages with protection diodes for direct control of

relays. The circuit outputs can be loaded with up to

200 mA / channel. To program the sequence the

SW1 switch of the DIP SWITCH type was used. LED

indicates recording sequence in programming

mode and in operation mode it indicates system

activity by blinking. Three buttons S1-S3 are used

to operate the module. In normal operation, the S1

button is used to replay the entire sequence, S2 to

reduce the playback speed and S3 to increase it. In

programming mode, S1 is used to save the step,

while S2 and S3 are used to complete the sequence

creation procedure and select how to play it back.

Circuit description

8-Channel LED Controller

AVT 1881

ASSEMBLY DIFFICULTY

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The controller has been mounted on a board with the

arrangement of the components as shown in Figure 2.

Start mounting according to general principles, first

solder the lowest components - resistors, and end with

the highest ones - connectors. Once the device is

assembled, the ICs must be placed in their sockets and

a 12 V power supply must be connected to the VCC

input. The controller itself draws current, in the order

of several milliamps, but the current capacity of the

power supply should be adjusted to match the

current drawn by the ICs.

The sequence programming mode is entered by

pressing and holding down the S1 button. This state will

be signalled by a longer illumination of the LED. The

programming itself is carried out by setting the selected

combination (on and off outputs) with switch SW1 and

confirming it with button S1. Setting the SW1 switch to

the "ON" position turns on the respective channel

(lights up the diode connected to the output) and in the

"OFF" position turns off that channel. When the S1

button is pressed, a brief flashing of the D1 diode

signals that the state set by switch SW1 is being

stored. Record the next steps in the sequence to be

created in the same way. When the microcontroller

memory is full of all 124 steps, the circuit will light the

LED longer each time the S1 button is pressed. Once

you have saved all the required sequences, you need

to decide if you want it to be played once or repeated

in a loop. Ending the sequence teaching procedure

Mounting and start-up

Fig. 1 Schematic diagram

Fig. 2 Mounting diagram

100nF100nF 100uF100uF

12VDC

78L05Z

1N4007

C4C3 C1C2

GND

VI 3

VCC

VDD

GND

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

LED1

LED2

LED3

LED4

LED5

LED6

R10

LED7

R11

LED8

R12

VCC

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

8O8 11

O1 18

O2 17

O3 16

O4 15

O5 14

O6 13

O7 12

CD+ 10

GND

U3 ULN2803

VCC

GND

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

4,7k

LED

R13

3 1

VDD

GND

LED

ATTINY2313

4,7k

(SCK)PB7 19

(MISO)PB6 18

(MOSI)PB5 17

PB4 16

(OCI)PB3 15

PB2 14

(AIN1)PB1 13

(AIN0)PB0 12

(ICP)PD6 11

(T1)PD5 9

(T0)PD4 8

(INT1)PD3 7

(INT0)PD2 6

(TXD)PD1 3

(RXD)PD0 2

GND

10 VCC

PA0

PA1

RESET

161

SW1

RP1

VDD

GND

RES

LED

with the S2 button will cause the sequence to play in an

infinite loop, while the S3 button will have the effect of

playing it once. During normal operation, when the S1

button is pressed, the sequence will be replayed from

the beginning. At any time during the operation of the

system, you can change the playback method without

changing the sequence. Simply enter teaching mode by

holding down the S1 button and then use the S2 (loop)

or S3 (single sequence) to exit the programming mode.

In both cases, the end of the programming procedure

will be signalled by the LED flashing in synch with the

display of the successive steps of the program being

played. In this mode, the S2 (decrease) and S3

(increase) buttons can be used to vary the rate of

change in 27 steps. All possible durations for a single

sequence are listed in Table 1. Once the controller has

been correctly assembled and programmed, you can

connect signal receivers to the OUT connectors.

Figure 3 shows an example of how to connect the LED

strip or relay.

Fig. 3 Example of how to connect the LED strip or relay

Sequence playback speeds

+ 12V -

No.

Czas trwania kroku

0,05 sec.

0,075 sec.

0,1 sec.

0,125 sec.

0,15 sec.

0,175 sec.

0,2 sec.

0,225 sec.

0,25 sec.

0,3 sec.

0,35 sec.

0,4 sec.

0,45 sec.

0,5 sec.

0,75 sec.

1 sec.

1,25 sec.

1,5 sec.

1,75 sec.

2 sec.

2,25 sec.

2,5 sec.

3,75 sec.

5 sec.

10 sec.

20 sec.

30 sec.

RP1:.............................RPACK 8×1 kΩ !

Resistors:

R5-R13:......................1 kΩ (brown-black-red-gold)

R1-R4: ........................4,7 kΩ (yellow-purple-red-gold)

C3, C4:........................100 nF (can be labelled 104)

LED, LED1-LED8:.....LED 3 mm !

D1:...............................1N4007 !

U1:...............................78L05 !

U3:...............................ULN2803A !

Other:

Semiconductors:

U2:...............................ATtiny2313 !

OUT1-OUT8, 12VDC: .............DG301-5,0

C1, C2:........................100 μF / 16 V !

Capacitors:

SW1: ............................................DIP SWITCH 8 sections !

S1-S3:..........................................microswitch button

List of elements

Begin assembly by soldering the components

onto the board in order of size from smallest

to largest. When mounting components marked

with an exclamation mark, pay attention to their

polarity. Photographs of the assembled kit may be

helpful. To access high-resolution images, download

the PDF file.

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Notes

The self-assembly 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 regulations

AVT SPV reserves the right to make changes without prior notice.Installation and connection of the appliance not in accordance with the instructions, unauthorised modification of

components and any structural alterations may cause damage to the appliance and endanger persons using it. In such a case, the manufacturer and its authorised representatives shall

not be liable for any damage arising directly or indirectly from the use or malfunction of the product.

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.

Leszczynowa 11 Street,

03-197 Warsaw, Poland

https://sklep.avt.pl/

AVT SPV Sp. z o.o.