PIC Wireless Networks Wifi (Hotspot) Detector

This wireless detector project allows you to sense the presence and relative signal strength of wireless hotspots. It is "always on" and communicates the presence and signal strength of an in-range hotspot by way of sequences of pulses - like a heartbeat you can feel. The stronger and faster the "heartbeat", the stronger the wireless signal detected.

This project consists of a microcontroller PIC 12F629, some custom interface electronics, a small vibe motor, and an off-the-shelf Wi-Fi detector from D-Link. The microcontroller periodically "presses" the button on the detector to initiate a reading. The microcontroller "reads" the output from the detector indicator LEDs and uses this as the basis for pulsing out a signal on the vibe motor, which the wearer can feel.

tag : wireless networks, hotspot detector, Wi-Fi strength signal indicator src

PIC Wireless Networks Wifi (Hotspot) Detector

This wireless detector project allows you to sense the presence and relative signal strength of wireless hotspots. It is "always on" and communicates the presence and signal strength of an in-range hotspot by way of sequences of pulses - like a heartbeat you can feel. The stronger and faster the "heartbeat", the stronger the wireless signal detected.

This project consists of a microcontroller PIC 12F629, some custom interface electronics, a small vibe motor, and an off-the-shelf Wi-Fi detector from D-Link. The microcontroller periodically "presses" the button on the detector to initiate a reading. The microcontroller "reads" the output from the detector indicator LEDs and uses this as the basis for pulsing out a signal on the vibe motor, which the wearer can feel.

tag : wireless networks, hotspot detector, Wi-Fi strength signal indicator src

Wireless Auto Tachometer Circuit

To use the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

Wireless Auto Tachometer Circuit

Using the Tach circuit, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

Wireless Auto Tachometer PCB

Accessory List.

• C1 1 0.47uF Capacitor
• C2 47uF Electrolytic Capacitor
• D1 8V 1W Zener Diode
• D2, D3, D4 1N914 Diode
• M1 200uA Meter
• Q1, Q2 2N3391A Transistor
• R1, R2, R9 1K 1/2 W Resistor
• R3 47K 1/2 W Resistor
• R4 10K 1/2 W Resistor
• R5, R6 25K Trim Pot
• R7 10K Trim Pot
• R8 200 Ohm 2 W Resistor
• R1 15K 1/2 W Resistor
• R1 2.2K 1/2 W Resistor
• S1 SPST Togglae Switch
• S2 Three Position Single Pole Rotary Switch

Remark:
1. Unit Calibration as folows:

1.1.Install the circuit:

1.2. Turn on the Tach and allow a few minutes for temperature stabilization.

1.3. Set S2 to 4 cylinders and adjust R5 for a meter indication of 180 (1800 rpm).

1.4. Set S2 to 6 cylinders and adjust R6 for a meter indication of 120 (1200 rpm).

1.5. Set S2 to 8 cylinders and adjust R7 for a meter indication of 90 (900 rpm).

2. Used the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

3. This unit draws power from a car battery. If it is connected backwards, it will not work, but it won’t be damaged.

SPOT : AVR Wireless Flash Trigger

The SPOT (strobist-project-opensource-trigger)is a remote flash trigger radio transceiver. It lets you adjust and trigger off-camera flashes remotely. It has two modes of operation: First, As a transmitter it sits on the hot shoe of a camera and forwards electrical flash trigger signals from the camera to slave flashes via radio. Secondly, As a receiver it is connected to a small hot shoe ("system") flash. The project use microcontroller AVR ATmega 8L as main controller.

Download :
Documentation and source

tag : microcontroller project, avr ATmega 8L, wireless flash triger

SPOT : AVR Wireless Flash Trigger

The SPOT (strobist-project-opensource-trigger)is a remote flash trigger radio transceiver. It lets you adjust and trigger off-camera flashes remotely. It has two modes of operation: First, As a transmitter it sits on the hot shoe of a camera and forwards electrical flash trigger signals from the camera to slave flashes via radio. Secondly, As a receiver it is connected to a small hot shoe ("system") flash. The project use microcontroller AVR ATmega 8L as main controller.

Download :
Documentation and source

tag : microcontroller project, avr ATmega 8L, wireless flash triger