Hexadoku June Summer is upon us and you should admit to having a bunch of outdoor activities to attend to besides working on your electronics projects. Elektor 1/ Elektor 1/ · Elektor Industry 6/ Elektor Industry ElektorLabs 6/ Year, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec. for you. Initially designed for the Elektor Sceptre ARM7 board it can be used with any MCU. in Elektor magazine | June | Find it here.

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The InterSceptre operates from 3. All this on a PCB that fits exactly into an attractive, Italian-designed case measuring 18 x 20 x 5. Even though the Sceptre offers lots of peripherals, it only has fifty pins, which means that certain functions are obliged to share pins.

In any case, there are very few applications elektof would require everything to be used at once. The InterSceptre extension board circuit diagram is available in the downloads below.

Given the number of ports implemented, the circuit is pretty huge, but easy enough to follow. We opted for male connectors to ensure compatibility with PC serial ports. On the microcontroller side, the four ports are connected to terminal strips that let you choose which will be used with a given COM port. For microcontrollers with more UARTs, the ports are jini to them. Two other switches offer the possibility of connecting terminating resistors if needed.

The MIDI port consists of just an input and an output. Given that the InterSceptre can operate from 3. Not to worry even if the switches have been set to the 3. Note that it is highly inadvisable to hot connect or disconnect equipment to this port.

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The InterSceptre [] – Elektor LABS | Elektor Magazine

The Internet module is powered from 3. These may adversely affect the maximum communication speed possible, so if the whole circuit can run off 3.

Note to that InterSceptre does not offer a 3. In this way, InterSceptre has four analogue outputs, available on the way sub-D connector K The gain of the output elketor is adjustable a bit too much, really, for reasons of simplicity and they are powered from 5 V, at all times, which means a 3.

The gain is adjusted using turn presets.

200 If unity gain is all you need, you can omit these and connect the inverting inputs directly to the outputs. This will save you a bit of money.

In this way, it is possible to connect a 3. The level shifter used comes from a Philips or NXP application note. If SDA is at 3. This IC is compatible with 3. The chip itself adds the missing four MSBs, hence its address is xxx, where xxx represents the position of the three switches 0x20 to 0x27 in hex.

Each of the signals is protected jni a small current-limiting resistor. This eleltor strip is opposite a little area with mounting holes where you can fit a few components to create an interface you need. During application development, the Sceptre will be connected to a computer via a USB cable connected either directly to the Sceptre, or via the InterSceptre. In this situation, the USB port can provide all the power. For applications where no USB connection is possible or necessary, or if more power is needed than can be supplied by a USB port, a 5 V supply is available via the InterSceptre.

We have made provision for two possible regulator elekor a or a low-voltage-drop stylewhich, for some unknown reason, do not have the same pin-outs.


Free Elektor magazine June 2010

So take care how you fit the regulator! The other diodes D2, D5, and the other D2 in the Sceptre take care of the rest. One important detail not to be overlooked: As already mentioned above, the InterSceptre itself does not produce the 3. One minor drawback with the Sceptre is the absence of the battery voltage on the extension connectors — but it does have its own battery.

If you use a different elektkr board without its own battery, a button cell holder elektoor available on the InterSceptre. You can connect a switch to JP9 to let you turn off the Sceptre power.

This can be handy where the Sceptre is being powered from a battery. The InterSceptre PCB has been designed to fit into a case which, in addition to providing protection, also lets you use the unit directly within a final application without its elekgor like a bodge.

The shells fix together using a pair of screws. Like the Sceptre, InterSceptre is also an open-source, open hardware project. So below you can find the Eagle files for the circuit diagram and PCB, the components list. For software please refer to ellektor Sceptre page. TV Elektor Ethics Back to top.

So what has InterSceptre got to offer? Well, quite a lot, actually: Detailed description The InterSceptre extension board circuit diagram is available in the downloads below. Power supply and battery During application development, the Sceptre will be connected to a computer via a USB cable connected either directly to the Sceptre, or via the InterSceptre.

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