Monitoring Temperature With The C64

COMPUTERS 049 MONITORING TEMPERATURE WITH THE C64 Maplin"s module Type FE33L provides an inexpensive and convenient means of monitoring temperature. The module has a built-in A-D converter and an Lc display and works from a single 1.5 V battery. Since it is often impractical to take frequent readings manually, the module provides a serial data output that can be used with most microprocessor systems. The combination of hardware and software given in this article enables a C64 comput- er to use the serial data, within BASIC, via the USR function. The hardware consists of nothing more than a simple ni level driver and may be mounted on a small piece of prototyping board. This may be connected to the module by three short wires, while the outputs go to a two-by-twelve 0.156" pitch edge connec- ELEKTOR ELECTRONICS JULY 1989 SUPPLEMENT for for the C64"s user port. Pins 5 and 16 of the module should be short-circuited to obtain the maximum sampling rate of one per second. Check all conn...