stm32f407 adc example

Before we study stm32f4 we have to know a little about the micro-controller. Micro-controller is a small computer on a small single integrated circuit, containing a processor, memory and programmable input-output prefers. Micro-controllers are designed for embedded applications. The majority of micro-controllers are used today by embedding in other machinery .such as automobiles, computer systems,[…]

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bus-fuse 12C-Circuit

All I2C cards published so far in this magazine (see References/bus-fuse) are normally powered by the 5 V supply in the PC via the 6-way DIN socket on the 12C PC insertion card. A drawback of this arrangement is that the 5 V supply in the PC is at risk of being short-circuited by a[…]

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I2C Parallel printer port adaptor

The circuit in the diagram permits I2C software programs to communicate via the Centronics outputs of any IBM compatible PC in conjunction with a buffer IC Type 74LSO5. This IC has open collector outputs to facilitate the parallel switching of I2C applications on the bus. A slight drawback of the present circuit is that everything[…]

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Hexadecimal display decoder

The byte to hex display decoder was designed because nibble to hex decoders are no longer produced commercially In Principle, it is, of course, not difficult to decode a nibble, but from byte to hex is generally more practical and requires fewer ICs. The decoder uses a GAL Type 22V10. This type has an adequate[…]

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Automatic power off

The power off circuit ensures that any load is automatically removed from a battery. It is particularly useful in cars so that if the driver forgets to switch off the headlights, he does not return to a car with a flat battery a couple of hours later. The only operating control is a spring-loaded change-over[…]

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