This emits laser light and the light should fall on the LDR. When it breaks by someone the alarm will on. To stop the alarm you should off and on again the circuit to work again.

This is an expansion card for the microbit.The microbit is powered by the expansion boardPorts 0, 1, 2, 3, have dupont connectorsAn output port is attached to a 2N2222 transistor in order to amplify the current.More info to comeIl s'agit d'une carte d'expansion pour le microbit. Le microbit est alimenté par la carte d'expansionLes ports 0, 1, 2, 3, sont munis de connecteurs dupontUn port de sortie est joint à un transistor 2N2222 afin d'amplifier le courant.Davantage d'information à venir

DIY Project: Upgrade your Amiga Tank Mouse into a high resolution Laser Mouse. This project was one of my weekend retro projects done two years ago. At that time, I wanted to upgrade my Amiga Mouse and ended up with this hand made PCB. :)After sharing the story in a local retro computing forum, people are interested in building their own. So I have modified the design to be manufactured by a factory and ordered a small batch of PCB's. I am sharing this PCB for those who are interested in building their own. Some basic knowledge on PIC micros and a compiler is also required. HardwareThe core of the project is an ADNS9800 laser mouse sensor. A PIC micro is used to convert x-y movements into Amiga type A-B quadrature pulses. Resolution of the mouse can be adjusted by placing the CONFIG jumper. When this jumper is in place, resolution can be increased/decreased by using the mouse buttons. A 3D printed lens holder is used to fix everything to the mouse case. Lens holder 3D design will be shared to public.BOM:1 ADNS9800 + Lens1 PIC18F2XK223 3.3K 08054 100nf 08053 1uF 08053 Short M3 screw2 Micro Switch2 Pin Header1 P Ch Mosfet1 3D Printed Lens BaseSince I don't want the project to be copied and sold without spending any efforts, I will not release the PIC HEX file. But it will very easy to write a simple firmware for this project. Also for those who are interested in building this project, core code sniplets are shown below. #define HORV1 LATCbits.LATC7=0; TRISCbits.TRISC7=0;#define HORV0 LATCbits.LATC7=1; TRISCbits.TRISC7=1;#define HORQ1 LATCbits.LATC6=0; TRISCbits.TRISC6=0;#define HORQ0 LATCbits.LATC6=1; TRISCbits.TRISC6=1;#define VERV1 LATCbits.LATC4=0; TRISCbits.TRISC4=0;#define VERV0 LATCbits.LATC4=1; TRISCbits.TRISC4=1;#define VERQ1 LATCbits.LATC5=0; TRISCbits.TRISC5=0;#define VERQ0 LATCbits.LATC5=1; TRISCbits.TRISC5=1;#define LBTN1 LATBbits.LATB0=0; TRISBbits.TRISB0=0;#define LBTN0 LATBbits.LATB0=1; TRISBbits.TRISB0=1;#define RBTN1 LATBbits.LATB1=0; TRISBbits.TRISB1=0;#define RBTN0 LATBbits.LATB1=1; TRISBbits.TRISB1=1;void SetPhases(void){ if (HorPhase==0) { HORQ0 HORV0 } else if (HorPhase==1) { HORQ1 HORV0 } else if (HorPhase==2) { HORQ1 HORV1 } else if (HorPhase==3) { HORQ0 HORV1 } if (VerPhase==0) { VERQ0 VERV0 } else if (VerPhase==1) { VERQ1 VERV0 } else if (VerPhase==2) { VERQ1 VERV1 } else if (VerPhase==3) { VERQ0 VERV1 }}This is the main loop: adnsGetDelta(&x,&y); while (((x!=0) || (y!=0))) { if (x>0) { x--; HorPhase--; if (HorPhase>3) HorPhase=3; } if (x<0) { x++; HorPhase++; if (HorPhase>3) HorPhase=0; } if (y>0) { y--; VerPhase--; if (VerPhase>3) VerPhase=3; } if (y<0) { y++; VerPhase++; if (VerPhase>3) VerPhase=0; } SetPhases(); Delay100TCYx(1); // 100uSec }NOTE: You will have to find an ADNS9800 library. ADNS9800 SPI pins are bit-banged, dedicated SPI hardware is not used.Details of the project can be found below. (Unfortunately in Turkish)https://www.commodore.gen.tr/forum/index.php?topic=14749.msg182994#msg182994

A laser triggered home defense system

This circuit is a simple laser anti theft alarm with SCR, laser, LDR and a few other components.When the theft body cut the laser beam, the buzzer turns ON and latch (stay ON) until the Reset button pressed. I designed the PCB in the shape of tiny house (my YouTube channel logo)Parts list:BT169LDR (3pcs)Laser 5V 5mW (3pcs)Buzzer10K PotentiometerPush button Youtube video: https://youtu.be/5gywcE4WEwk

### DESCRIPTIONSupport Patreon https://www.patreon.com/securesupplies?fan_landing=trueStanley Meyer Gerber 9xb Circuit the basic circuit to drive water fuel cell for making hydrogenID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part1 DIP SWITCHEI-04 DIP1 1 2 BRIDGE-KBU KUB808G B1 1 3 CAP-D10.0XF5.0 1000uf C1 3 4 TO-220 REG 7805 U1 1 5 CAP-D8.0XF3.5 330uf C2 1 6 RAD-0.2 10NF C3 2 7 DIL06 OPTO IC4 1 8 RTH025W 220R R4 6 9 DIP-14 74LS90N IC 2 4 10 IC 555 IC 555 IC1 1 11 LED-2*5*7 LED1 1 12 1K 1K R2 13 10M 10M R1 14 4.7K 4.7K R3 15 7404 IC 7404 IC IC 3 ### TECHNICAL DETAILS / COMPONENTSthis simple circuit contains voltage control and pwm to drive variac and scr switch for gating### LEARN / TOPIC / BUILD INSTRUCTIONSSecure Supplies danieldonatelli1@gmail.com whatsapp + 1 520 848 1659 https://danieldonatelli.wixsite.com/hho-pocket-guide/9xb-stanley-meyer www.secure-supply.com www.hot-rod-usa.com

### DESCRIPTIONA tracker board for use with an FPGA and the HTC Vive Base Stations### TECHNICAL DETAILS / COMPONENTS### LEARN / TOPIC / BUILD INSTRUCTIONSHere's the source:https://github.com/Roboy/HTC_Vive_Sensors/tree/master/V0.3 More detail on the project:hackaday.io/project/19570-htc-vive-lighthouse-custom-tracking

Usually the extrusion heads in custom 3D printers have too many cables that need to be carried to the base plate, which makes it difficult to change the extruder through another working head.I have designed this PCB for the extruder in order to reduce the extruder connections to just one. This would allow the extruder to be treated as a module so that it could be removed easily to be replaced by another working head such as a laser module or a drill.The board allows the connection of a sensor of autolevel by means of servo motor and end switch or by sensors type BLTouch.The currents required for each signal have been calculated for both 12V and 24V systems and the trace width has been adapted to operate normally.The upper holes have a 31mm spacing to be screwed to NEMA 17 stepper motors.It is designed to use connectors type XH and VH:Thermistor: XH 2pin connector.Fan for cooling de estruder: XH 2pin connector.Probe or limit switch for autolevel: XH 2pin connector.Servo motor for autolevel: XH 3pin connector.Stepper motor: XH 4pin connector.Heating tube: VH 2pin connector.PWM Laser/Layer fan: VH 2pin connector.Interface: 26pin ribbon connector.The system requires 2 of that boards, one for the extruder and other for interfacing the ribbon cable to separate cables to the 3d printer main board. Also can be put the necessary conectors at the end of the ribbon cable and use only one extruder PCB for the extruder.