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Usb,serial & I2c Multi I/o, Adc, Dac And Twin Relay For Sale
Multi-Purpose I/O Board
Multi-Purpose I/O Board
This is a multi purpose input / Output board that can be used directly with a
PC via a USB port or with a Microcontroller either using a serial interface or
USB interface for connecting to a PC. When connected this will present
itself as a COM port and communication can commence via HyperTerminal or
other terminal software (software included in the resources pack). VB can also be used using the MSComm component or
indeed any program that can communicate via the COM port
On board voltage regulator protects the PC from short circuits. Also
when used with a microcontroller the input voltage can be up to 10V.
Input connector that can accept either serial OR I2C
OPTIONAL jumper to disconnect the USB chip when used with a microcontroller
Standard FTDI USB to Serial chip has standard drivers for PC,MAC and
Linux. The drivers are already built into Linux.
Four 10 bit analogue to digital inputs with an accurate reference
voltage that can be set to 1.024V, 2.048V and 4.096V
Two Digital to analogue outputs that can be set to give an analogue
output from 0 to +V in 63 steps.
Two relays outputs up to 10A @ 250VAC and 10A 24V DC
An 8 port digital switch using the ULN2803 Darlington output. This is
capable of switching up to 1/2 Amp per port. and Voltages up to 50V.
The o/p is pulse width modulated and so the output power can be varied.
This is connected to the digital switch and can either input or output 8
zip file , includes free terminal software
The device is operated serially either via the USB or directly through
connector (3). Initially the device will recognise the
Baud rate (from a fixed set) when it receives the first carriage return. This
can be 'fixed' by using the system settings. There is also an acknowledge
mechanism that will enable the device to operate efficiently without connecting
the hardware handshake line (CTS/RTS).
Commands are based on the VT100 command set that use escape codes. For
example to turn on relay A the following would be sent to the device:
to turn it off would be:
All of the commands follow the same pattern.
The device can recognise when an I2C bus is connected and automatically
switch to that mode. The default address is 0x64 (8 bit) 0x32 (7 bit) but can be
changed to any address within the range 2 - 0xfe by the user. When using I2C the
escape codes are replaced by single byte commands.
There is an 8 bit wide digital input and output port. The output is connected
to a Darlington driver for driving high power devices such as motors and
solenoids. The output on each channel has an independent pulse width modulation
that can be varied form completely off (0) to fully on (255) in 255 steps. This
could vary the brightness of lamps or speed of motors.
Analogue to Digital
There are 4 ADC channels that are continually scanned by the firmware. In
addition there is a built in precision voltage reference that can be set to one
of three levels, 1.024V, 2.048V and 4.096V. The setting is
simply a matter of issuing a command.
Digital to Analogue
There are two analogue outputs that can be digitally controlled in 64 steps
to give a range of output from 0V to 5V.
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Usb,serial & I2c Multi I/o, Adc, Dac And Twin Relay: $27