I had successfully read LT400 through Modbus potocol. The TTL to RS485 coverter I was use showed in the attached photo.

I am using an external 12V battery for the testing setup.

I burnt out one of the logic pin somehow, I could not find out the reason. maybe the 12V meet the logic pin accidentally.

I sent a private message to you…[Read more]

The schematic ADC’s name printed as ADS1105 but not ADS1115.

I designed my datalogger using Mayfly with a 4000mAh 3.7 Li battery and a 0.75W 6V solar panel.
Sleep mode was added.
The battery can last for 30 days (4.13V drop to 3.7V) without solar panel. If solar panel added, It can provide enough power even during cloudy day.

10W solar panel may be too much. But it is really depend on the power…[Read more]

I am working on reading the In-situ LevelTroll 400 water level sensor through Mosbus, it required a 12V-24V input.
I have check the Mayfly sw5V boost SC4503 datasheet, it allow step up voltage up to 27V.
If I follow the output voltage formula in the datasheet R1 = R2 (Vout/1.25V – 1), If Vout = 12V, R1/R2 = 8.6
I need to modify the…[Read more]

I made the FONA 3G shield like this

Problem solved(7 Feb 2017)
I am now using hardware interrupts D10 (you need to cut the trace solder a jumper to D10 at SJ1 on the back of the board)
Now you don’t need the pin change interrupt library(conflict with SDI library)

Below is the code:…[Read more]

I am now using hardware interrupts D10 (you need to cut the trace solder a jumper to D10 at SJ1 on the back of the board)

Now you don’t need the pin change interrupt library 🙂

Below is the code

//Sleep mode setting 
#include <avr/sleep.h>

//RTC…

[Read more]

I am now using hardware interrupts D10 (you need to cut the trace solder a jumper to D10 at SJ1 on the back of the board)

Now you don’t need the pin change interrupt library 🙂

Below is the code

//Sleep mode setting 
#include <avr/sleep.h>

//RTC…

[Read more]

I will test it in coming days.

I try to combine the sleep mode code to my SDI12 logger code. Unfortunately the SDI12 library crash with the Sodaq PcInt library.

I am not familiar with how Arduino library work. Is that any way can solve it? So that I can implement the sleep mode in my SDI12 logger

Below is the Error:

For the current setup(using Mayfly datalogger) with cable length 1 m to sensor, I only test it in office for four days.
Previous setup(replaced by Mayfly now) using Pro Micro, SD breakout, RTC breakout and 3G breakout. I tested it in office for 21 days.

Both test result were good. But still need to fix some minor…[Read more]

I am using In-situ Inc Level TROLL Data Logger for water level monitoring.
https://in-situ.com/product-category/water-level-monitoring/
The extra pins are for RS485(2 pins) and 4-20mA(1 pin). I am not using it now but I may switch from SDI12 to RS485 in future.

I may purchase more…[Read more]