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12-bit ADC for BASIC-52
ADS1286 is a nice little ADC with up to 20kHz sample rate, internal S&H circuit, and sucks up less than 500uA while operating (only 3uA in shutdown). It comes in 8-pin DIP (hobbyist friendly!) and SOIC packages and is very easy to use. External VREF allows you to set appropriate input range for your application. It is not very cheap, and only has one input (although differential) but other than these, it is lovely. As you can see from the schematics and sample code, it is both easy to hook up and easy to program for. The sample below takes ADC readings and just prints them. Run it and turn the pot, you should see the reading chage from almost 0 to almost 4096, with 5V VREF the output resolution is about 1.2mV.
10 REM ADS1286 demo v1 15 GOSUB 1050 20 GOSUB 1200 30 PRINT AV 40 GOTO 20 1000 REM start conversion 1010 PORT1=0FFH 1015 PORT1=07DH 1020 RETURN 1050 REM stop ADC 1060 PORT1=0FFH 1070 RETURN 1100 REM one clock, leaves clock high 1110 PORT1=07DH 1120 PORT1=07FH 1130 RETURN 1200 REM take ADC reading 1210 GOSUB 1000 1215 AV=0 1220 GOSUB 1100 : GOSUB 1100 : GOSUB 1100 1230 FOR I=1 TO 12 1240 GOSUB 1100 1250 BT=PORT1.AND.1 1260 AV=AV+AV+BT 1270 NEXT I 1280 GOSUB 1050 1290 RETURN
Want to get voltage reading. No problem. Just measure the VREF voltage, and modify the program to read (set V to your VREF voltage on line 16):
10 REM ADS1286 demo v1 15 GOSUB 1050 16 V=5.1 20 GOSUB 1200 30 PRINT V/4096*AV 40 GOTO 20 ...
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