Serial Comms and Crystals

[Tabsoft]

To get a better understanding what is going on, why don't you make a small change for debugging.

Instead of this...

for bits =39 to 0 step -1
    tmr2=0
    while (!dht_data) 
    wend 
    t2con=6
    while ( dht_data) 
    wend 
    t2con=0
    if ((tmr2>12)&&(tmr2<50)) then ' noise ?
        if (tmr2 >31 ) then
            dht.0[bits] = 1 
        
        endif 
    
    else
        goto badread ' noise ?
    endif
next

Do this instead...

 
 for bits =39 to 0 step -1
     tmr2=0
     while (!dht_data) 
     wend 
     t2con=6
     while ( dht_data) 
     wend 
     t2con=0
     if tmr2 <= 12 then goto tooshort
     if tmr2 => 50 then goto toolong
     if (tmr2 >31 ) then
        dht.0[bits] = 1 
     endif 

 next

Then create the 2 subs, tooshort and toolong and have each print a different error message.

[falingtrea]

TI and Silicon Labs have RH/Temperature devices with an I2C interface in the $5.00 single part range: Si7013, Si7020, Si7021 2%-4% accuracy TI HDC1000 and HDC1008 similar accuracy specification. Both are available at Digikey. Honeywell also has a device, HIH6130, but it is a bit more expensive, at $14.

[Scampy]

Guys, thanks for the additional replies,

@Tim, I'll check out those suggestions... cheers