This is a circuit monitoring device. It runs for over 10 days and can log up to 32k events both digital and analog. Samples are logged either on a timing basis (.01 to 2.5 seconds), or on a triggered basis. Four inputs are provided, up to three of which can be analog. All setup and configuration is done via a terminal program. Once configured, the device can run stand-alone monitoring a circuit. The device can then be connected back to a terminal program for data retrieval.
Click here to download the full size of the above Circuit.
Any terminal program can be used to communicate with this device. Plug a standard DB-9 cable into the onboard connector and 8-24 volts into the power connector. Set the baud rate for 19200, full duplex, no parity, one stop bit and no hardware or software handshaking. (Note: only lines 2,3 and 5 are used for this function.) The same DB-9 connector is used in the stand-alone mode. Simply make up a cable using a DB-9 male connector and any type of clips, connectors, or leads that you need. (Click on image above to see an example). In this mode, the connections are as follows:
pin-5 Ground
pin-7 8 to 24 Volts
pin-1 Input #1
pin-6 Input #2
pin-9 Input #3
pin-8 Input #4
(You will probably want to configure the unit for your specific use: see instructions below)
When power is applied to the unit with no computer connected, the LED flashes rapidly. This is the standby mode. Holding down the button for over 2 seconds causes the LED to go out. The unit is now armed and will react to changes in any of the 4 input lines (in the trigger mode), or just start storing (in the timing mode). After that, any event will cause a brief flash.
The data will be stored until one of the following occurs:
1. The 250 hour time limit is reached.
2. The 32k maximum events are stored.
3. The unit is powered off.
Once the data is captured, just disconnect it from the circuit you are testing. Then connect the unit to your computer...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: