Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
Re: Temperature
|
Byon would have to answer for sure, but the TT4 is a microcontroller. I am pretty confident there is no formula interpreter for the TSTAT message (or any other message). I am sure the manual does not make any reference to such things. I assume ytou are taking a temperature sensor and using amplification or some other means to improve the resolution.? Howver, if your circuit does scale the temperature range to 0 - 5V, your formula won't work. Converting the voltage range of 0 to 5V scaled as -40 to 100 degrees would require the formula to be ?? T ???????????? = ?? (^7 * 140 / 5) - 40???????? where ^7 is in volts (140 / 5 = 28). ?? -40 deg??? =??????? (0V * 28) - 40??????????? HIRES TRUE = 0? bits??????????? HIRES FALSE = 0 ?? 100 deg?? =??????? (5V * 28) - 40? ????????? HIRES TRUE = 999 bits???????? HIRES FALSE = 255 ???? 25 deg?? =????(2.321 * 28) - 40 ????????? HIRES TRUE = 464 bits????????? HIRES FALSE = 118 I suggest connecting your sensor to JP4 (and use ^4 for the voltage).? I don't use JP5 because the header already has a pullup to Vcc.? This could alter youyr readings.? You can read the voltage using ^4 in TSTAT or BTEXT, but it won't be converted to temperature.? For that, you can either convert the voltage manually (after a while you get a feel for Voltage to temperature), or use the Telemetry (TPeriod > 0) to convert the data in an APRS client.? Using the telemetry , you can go to aprs.fi and see a graph of you data.? You just set TPERIOD > 0 to send the data.? The Telemtry message is sent in bits according to TELHIRES TRUE (values are 0 - 999 for voltages between 0 and 5V). For proper decode, you need to send the proper messages: With? ????TELHIRES TRUE ??? TELVOLT TRUE?????????? => PA2 is reported first in the data????TELTEMP TRUE ???????? => PA1 is reported Second in the data You would send the following, fo all statuins to properly interpret your data: To {TT4 call-ssid}:PARM.PA2,PA1,PA5,PA4,PA3 To {TT4 call-ssid}:UNITS.Vols,degC,Volts,DegC,Volts To {TT4 call-ssid}:EQNS.A1,B1,C1,A2,B2,C2,A3,B3,C3,A4,B4,C4,A5,B5,C5 So the known equations would be: PA2 is Vin ?????? => ????? A1=0,? B1=0.0278,?? C1=0 PA1 is Tin??????? => ????? A2=0,? B2=0.5000,?? C2=-273.15 PA5 is V????????? => ????? A3=0,? B3=0.0050,?? C3=0 PA4 is Tnew??? =>?????? A4=0,? B4=0.1402,?? C4=-40 PA3 is V ???????? => ????? A5=0,? B350.0050,?? C5=0 FYI: On the other hand, the TT4 (kit) uses an LM335. The output is 10mV / degK (pretty common for temperature sensors of this type). So, the range of the sensor is 0 - 5.00V or 0 - 500 degK => -273.15C to 226.85C The TT4 does the calculation for ^T and ^t with that expectation. Robert Giuliano
On Sunday, May 23, 2021, 6:59:09 PM EDT, py5lf_ <py5lf@...> wrote:
Robert? Sorry my mistake , its PA2 , pin 38 . There is an option to send the raw tension in the PA2 , so my idea is to use an external temperature sensor more accurately?and make scaling . For instance, the sensor gives me 0 to 5V , which means , -40 to 100 degrees . Is it possible??? Something likes this : TSTATUS = Temperature: ((^7*100)/50) Em dom., 23 de mai. de 2021 ¨¤s 18:52, Rob Giuliano via <kb8rco=[email protected]> escreveu:
--
PY5LF? Luciano Fabricio |
to navigate to use esc to dismiss