Check out the EnviroDIY Mayfly Data Logger, a powerful user-programmable microprocessor board that is fully compatible with Arduino IDE software.
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neilh replied to the topic AREF in the forum Mayfly Data Logger 2 days, 18 hours ago
Hello Shannon/@shicks – thanks for the detail.I missed that it was an internal connection on the mega1284 to the 3.3V
The issue with the 3.3V, is that it is connected to the LiIon through the regulator SPX3819.
The regulator has a dropout that is variable depending on the load, temperature etc – so from the datasheet at load of 500mA it could be…[Read more]
Shannon Hicks replied to the topic AREF in the forum Mayfly Data Logger 2 days, 20 hours ago
The AREF pin of the micro on the Mayfly is not tied to anything (except through a capacitor to ground as suggested in the ATmega datasheet), so when you use the standard analogRead(0) command, it uses the default 3.3v reference setting. If a user is more advanced and wants to use an internal reference by using certain commands, or by connecting…[Read more]
neilh started the topic AREF in the forum Mayfly Data Logger 3 days, 17 hours ago
Just wondering if AREF connects to a voltage source.? Looking at the rev0.5B and IC1 pin 29 labeled AREF I can’t find how AREF connects to 3.3V – but its probably I’m missing something. If it was an annotated PDF I could search for AREF.
The code suggests AREF is connected to 3.3V.
If it does connect to 3.3V, can it be disconnected, leaving C19…[Read more]
Sara Damiano replied to the topic Trouble initializing XBee3 LTE-M in the forum Mayfly Data Logger 5 days, 15 hours ago
I’ve spent more time fiddling with the LTE-M XBee and I’m seeing the same results.
It’s a hardware problem, not software; the modem really does stop responding. I wonder if it’s that there’s not enough capacitance along the power line causing very short voltage drops even when it’s tied right to the battery. The user guide for the LTE-M XBee…[Read more]
Sara Damiano replied to the topic Optical dissolved oxygen solutions? in the forum Environmental Sensors 1 week, 2 days ago
I’ve made an Arduino library for communicating with the Yosemitech sensors: https://github.com/EnviroDIY/YosemitechModbus
It’s built on top of my modbus library: https://github.com/EnviroDIY/SensorModbusMaster
In the modbus library there’s a hardware folder with the plans for a little “wing” board to more easily connect a Yosemitech sensor to…[Read more]
EllieBell became a registered member 1 week, 2 days ago
rushi replied to the topic Optical dissolved oxygen solutions? in the forum Environmental Sensors 1 week, 3 days ago
Hi Thomas and anthony,
I know it has been long since the post was discussed but by any chance did you guys move along with the project and made any breakthroughs? It would really help me alot.
Thanks