Wifi Temperature/Humidity Help?
#1
Posted 07 November 2011 - 04:37 AM
#2
Posted 07 November 2011 - 08:05 AM
I can't say anything about the Wifi shield, nor about Ethernet related stuffs: I'm not the right person to evaluate such a devices. Thus, I can't say whether the standard Netduino would fit you target, or you must switch to the Plus version (with Ethernet embedded).
However, bear in mind that the Plus version supports the SD memories, thus as a data logger is surely a good bet.
The probes should working fine, although you should apply some basic hardware hacking. For instance, the humidity sensor gives you an output ranging from zero to almost 5 Volts. This is too much for the Netduino analog inputs, thus you must provide a simple voltage divisor (i.e. a resistor pair).
There are some best-practice task to consider as well. For instance, I've written a small article about the noise on the analog readings. You should follow some tip to obtain a good stability on measurements.
The only bad news is the low-power capability, which is totally missing. At least, I mean an idle current below 1 mA, such having a quite long life of a normal battery.
At the moment, I'm terminating a simple circuit to both add a RTC (real-time clock) to the Netduino, and take advantage of it for placing the circuit in a sleep-then-awake mode. Perhaps may be interesting for your goal.
Finally, about the tools, I'd suggest *at least* a good/decent multimeter. Another very useful tool for anyone is working on hardware is a scope, but it's much more pricey than a simple multimeter. As long you don't perform hard tasks, a multimeter could be enough.
Hope it helps.
Cheers
#3
Posted 07 November 2011 - 09:57 PM
The probes should working fine, although you should apply some basic hardware hacking. For instance, the humidity sensor gives you an output ranging from zero to almost 5 Volts. This is too much for the Netduino analog inputs, thus you must provide a simple voltage divisor (i.e. a resistor pair).
Mario, I've noticed that the 5V is not very accurate (when using USB, could be my computer Power supply though), but the 3.3V on the Netduino is perfect. If you feed the HIH-4030 an unstable 5V, and use a voltage divider on the result, won't you get a rather unstable reading? Should you use another/independent voltage divider on the 5V to use as the Analog Reference? I've seen a post on the forum about the sensor working with 3.3V, but I think that is out of spec.
-Valkyrie-MT
#4
Posted 07 November 2011 - 11:05 PM
#5
Posted 07 November 2011 - 11:38 PM
-- H.L. Mencken, "What I Believe"
#6
Posted 07 November 2011 - 11:58 PM
#7
Posted 08 November 2011 - 01:10 AM
#8
Posted 08 November 2011 - 01:55 AM
1x Netduino
1x Wifi component from Weburban - http://store.weburba...urban/wifi.html
Hi Omnomnomsies,
My brief review of the datasheet for the Weburban WiFi component indicates that it is designed for PIC microcontrollers, and that it requires a TCP/IP stack loaded onto the PIC. I am skeptical that this WiFi component can interface directly with Netduino, since Netduino is based on an ARM MCU core. Sure, physically it might be able to connect, but in terms of the software, I am unaware of any C# TCP/IP stack written to specifically connect Netduino with this WiFi module. I see that there are Arduino libraries for this module, so maybe it is a simple matter of porting the Arduino libraries to Netduino; however, that might not be so simple.
For Wi-Fi on Netduino, I use a Gainspan GS1011MIP module. The link there is to a forum post I made a while ago. There is sample code there to get you started. The Gainspan is the same price as the Weburban module if you get it from Sparkfun.com.
Edit: just to clarify- the Gainspan module operates at 3.3v on a UART connection, not SPI like the Weburban one, in case that matters to you.
Edit 2: I just noticed you're looking for 802.11n. The Gainspan operates on 802.11b, so this might not be a good solution for you...
Why do you need 802.11n for your project? I have found most 802.11n Wi-Fi devices are backwards compatible with 802.11b/g. I am able to run a Wi-Fi web server directly from the Gainspan and my laptop has no problem connecting. I use a Netduino Plus for the built-in SD card, to store the web pages that I serve from the module. Works great.
- mcinnes01 likes this
#9
Posted 08 November 2011 - 02:38 AM
#10
Posted 08 November 2011 - 05:02 AM
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