Optimize approach for combined voltage boost & RS-485 conversion

EnviroDIY / YosemitechModbus

A library to use an Arduino as a master to control and communicate with the modbus sensors produced by Yosemitech. Depends on the EnviroDIY/SensorModbusMaster library.

Other

10 stars 7 forks source link

Optimize approach for combined voltage boost & RS-485 conversion #10

Closed aufdenkampe closed 6 years ago

aufdenkampe commented 6 years ago

Let's use this as a place to document our work with @bschulz1701.

Goal is to have a structurally stable wiring harness or shield, that is easy to assemble and that:

Utilize the WINGONEER TTL to RS485 Adapter / 485 to Serial Port UART Level Converter Module (XY-017) via the AltSoftSerial library, which requires Mayfly pins D5 & D6 for RX/TX and Mayfly's switched 3.3V power
Power the Modbus sensor off the Mayfly switched 5V power which we then boost to 9V (most Yosemitech sensors) or to 12V (for the Yosemitech sondes).

Background:

We used to use the wiring approach shown on the main readme here, https://github.com/EnviroDIY/YosemitechModbus#suggested-setup-with-an-envirodiy-mayfly, but we found it to be unstable because it used SoftwareSerial rather than AltSoftSerial. See #3 starting here: https://github.com/EnviroDIY/YosemitechModbus/issues/3#issuecomment-359947426
Working on Sonde support in issue #6

aufdenkampe commented 6 years ago

@bschulz1701, you can test the turbidity sensor I left for you by:

first running this sketch to get slave ID: https://github.com/EnviroDIY/YosemitechModbus/tree/master/utilities/GetSlaveID
then run this sketch, after changing to the slaveID: https://github.com/EnviroDIY/YosemitechModbus/tree/master/examples/GetValues

aufdenkampe commented 6 years ago

Here's the schematic for that shield that Beth and I developed, using the Pololu 9V Step-Up Voltage Regulator U3V12F9, which worked great for everything except powering the brush:

SRGDamia1 commented 6 years ago

Yeah.. My wish-list definitely includes a single board that includes both the RS485 conversion and the power boost, preferably with grove on one end and multiple sets of A/B/Gnd screw terminals on the other.

SRGDamia1 commented 6 years ago

I also want a nice little micro-shield like the ones we have for a grove connection on Serial/Serial1 but for AltSoftSerial.

aufdenkampe commented 6 years ago

@SRGDamia1, These are photos of the ones Beth and I developed one as a prototype (schematic above), for AltSoftSerial.

They work great for everything but the brush function. They are also a total pain to solder all those jumper wires.

@bschulz1701 is working on helping us find a setup that works for all functions, and then print out a circuit board, so that we just have to solder the components. We'll share the Eagle files in this repo.

aufdenkampe commented 6 years ago

@bschulz1701, Thanks for asking which repo to put your hardware work. At the moment our hardware info @is at https://github.com/EnviroDIY/YosemitechModbus#hardware

However, given that we want to use this for all Modbus devices, I think it might make sense to put it here: https://github.com/EnviroDIY/SensorModbusMaster

Let's do that. I just created a "Hardware" branch in SensorModbusMaster. In that branch is a "Hardware" folder. Let's use that to put all the hardware info, eventually including instructions in that new readme file https://github.com/EnviroDIY/SensorModbusMaster/tree/hardware