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> Iom #136 serial io, 12-bit a/d, dallas 1-w
Iom #136 serial io, 12-bit a/d, dallas 1-w
The IOM #136 is an assembled unit that is controlled by a PC COM port or similar (9600 baud, 8 data bits, no parity, no flow control). The intent is to provide a programmable input, output, 12-bit A/D and temperature measurement design which you may customize to meet your specific applications.
The module provides eight addressable TTL level outputs (15 mA source and sink) which may be used to operate LEDs, transistors or FETs which in turn may operate mechanical or solid state relays.
It also provides for the reading of six TTL level inputs.
In addition, it provides eight 12-bit analog to digital converters which may be configured using a number of Vref+ and Vref- combinations.
Access to the eight outputs, six inputs and eight A/Ds is available at holes adjacent to the processor.
Further, the unit provides the capability of interfacing with various Dallas 1-Wire devices on up to eight twisted pairs. In theory, up to 256 1_wire device may be accommodated on each twisted pair. However, the limiting factor is the capacitance and my suggestion is up to sixteen devices on a maximum of 200 feet on each twisted pair run. Note that only four 4.7K pull up resistors have been soldered in place and the signal leads connected to the screw type connectors for four of the eight Dallas runs. The user may simply add pullup resistors and solder additional leads to add the four additional twisted pair runs.
Any mix of the following Dallas devices may be accommodated on each of the Dallas runs. DS18S20, DS18B20 and DS1822 temperature sensor and DS2438X temperature and A/D converter, and DS2423 Dual 32-bit Counter.
For additional information, please see my web site.
