8 CHANNEL USB RELAY CARD co r USB port to te u p m co r u Use yo world.
Features & specifications Eight relay channels controlled by your computer! Use your computer USB port to connect to the outside world. Connect up to 16A to each of the high power relays. Board space for extra VDR noise suppressors is provided and on board push buttons can be used to test/operate all the relays.
Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip. • Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
Assembly hints * Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaflet. 1.3 Soldering Hints : 1- Mount the component against the PCB surface and carefully solder the leads 2- Make sure the solder joints are cone-shaped and shiny 3- Trim excess leads as close as possible to the solder joint REMOVE THEM FROM THE TAPE ONE AT A TIME ! DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 1. Diodes (check the polarity) 6. LEDs. Watch the polarity! D... CATHODE LD1 CATHODE D1 ... D10 : 1N4148 D11 ... D14 : 1N4007 LD1 ... LD11 : 3mm RED LD1 … LD8 LD9 LD10 LD11 2. Resistors. R... : Output indication : USB DATA : USB power indication : Relay power indication 7. Transistors R1 ... R21 R22 : 1K : 4.7 (1 - 0 - 2 - B) (4 - 7 - B - B) R23 ... R36 : 100K (1 - 0 - 0 - 3 - 1) R37 ... R46 : 200K (2 - 0 - 0 - 3 - 1) 3. IC socket.
Construction 10. Terminal blocks 15. Relays SK1 : 2p power supply SK2 ... SK9 : 2p (channels 1 ... 8) RY1 RY5 RY2 RY6 RY3 RY7 RY4 RY8 Important : Put an extra layer of solder on all pre-thinned PCB tracks, to improve their current handling capabilities. 11. Electrolytic capacitors. Watch the polarity ! C8, C9 : 4,7µF 16. IC. Watch the position of the notch! C... IC1 : VK8090 programmed PIC18F14K50-I/P or eq. 17. Rubber feet 12. Quartz crystal X...
Test & connection 19. Test and connection The card uses a separate supply for the relays and one for the board microcontroller. Test 1: Connect a power supply of 9 to 10Vac or 12 to 14Vdc (minimum 500mA). The power LED should turn on. The USB power LED will also turn on (indicating that the microprocessor power is ON). • Push the buttons and the relays should activate. • • • Test 2: • • • • Disconnect the power supply. Connect the USB port to the PC. The USB power LED should turn on.
PCB PCB 9
GND R37 200K O SW1 GND SW2 R39 200K 100K R15 1K 100K R14 1K SK11 GND C9 4.
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