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Educational Logic gate PCB by PCBWay.com This PCB project designed to learning students how logic gates works The circuit used 4 ICs to simulation 8 basic logic gates (AND-NAND-OR-NOR-NOT-XOR-XNOR-Buffer)  You can order this PCB from here: https://www.pcbway.com/project/shareproject/Educational_logic_gates_PCB.html Get 10 PCBs for Only $5 (First Order Completely Free) https://www.pcbway.com PCBWay is a chines PCB manufacture which make PCBs with high quality and low price Parts list: IC 4011 IC 4081 IC 4071 IC 4030 or 4070 LED Green (8pcs) LED Red (14pcs) IC Socket 14dip (4pcs) C1 Capacitor 220uF 10V C2 Capacitor 100nF R1 to R15 (except R5) Resistor 10K (14pcs)  R5-R16-R15 Resistor270R (3pcb) Push button switch (14pcs) Micro USB socket Circuit diagrams: There are 100nF and 220uF Capacitor between VCC and GND Download the Gerber file here: https://drive.google.com/open?id=1267Jn87LuZV3SvwyiM09YhhPc2et9mCZ Video:

This RF remote control based on IC PT2272-M4, can used with or without Arduino. it is very easy to use. There are one channel, two and four channels remote control module in the markets. There are 3 types modules in terms of switching method: 1-If the module made by IC PT2272- M4 , that means the output will be HIGH when you push the button and be LOW when you release the button. 2-If the module made by IC PT2272- T4 , that means the output will be HIGH when you push the button and be LOW when you press the button again. 3-If the module made by IC PT2272- L4 , that means the A-output will be HIGH when you push the A-button and be LOW when you press B-button. By this remote control you can run any load from 50 to 100 meters. You have to add a transistor and relay(as figure) for running 110/220v AC or some DC power LEDs.   Receiver module: Based on PT2272-M4 chip Working frequency: 315MHz Working Voltage: DC 5V Static current: 4.5mA Pin assignment: D0: Output 0 D1: Output 1 D2: Outpu...

There are many ways to water and energy saving that help to reducing water and electric bill and also help to environment. 29 tips briefly: 1-Using LED lamps rather than CFL or incandescent lamps. 2-Using auto light switch for garden lights. that turn on your garden lamps at night and turn off that in daylight automatically. 3- Using motion sensor switch help to optimizing electric consumption. 4-Solar energy can product all or some power needed in your home 5-Using solar water heater   6-Double glazed windows work as a heat insulator so doesn't allow to heat go outside in winner and doesn't allow to heat come inside in summer. 7-Don't run air conditioner and ceiling fan together because the ceiling fan push the heat air down.   8- Always set your conditioner in auto state then choose suitable temp. that you want. in this state the conditioner stops when arrive to that temp. so help to power saving.  9-New fridge always have an incandescent lamp that consume high power a...

Each LED board contain 3 basic parts: LED module, controller, power supply LED module LED modules can connect together to make a big display. there are single color LED modules, 2colors and full colors(RGB) LED modules. since traditionally LEDs when leaves in sunlight for long time loss its first brightness, so that modules make by special LEDs that have higher resistance to sun ray.   Controller controller (some time call mother board) contain LED display driver, memory and back up battery. Power supply power supply is a 5v regulated adapter and its current is between 1A to 50A or more (according to number of modules that make bigness of display) Note: connecting + and - in reverse causes damage for both controller and LED modules. Programing process For programming the LED board first must install "HD2013" program on your computer. You can download it from following link( password=168 ): https://drive.google.com/open?id=0B4jg9KxpTKGTeWZzbU11Yl82cG8 when installing comple...