# Yf-s201 Water Flow Sensor Node Red Gauge

**URL:** <https://discourse.nodered.org/t/yf-s201-water-flow-sensor-node-red-gauge/26105>\
**Category:** Dashboard\
**Created:** [5 May 2020 01:21 UTC](https://discourse.nodered.org/t/yf-s201-water-flow-sensor-node-red-gauge/26105 "2020-05-05T01:21:48Z")\
**Posts on this page:** 1\
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**Author:** ![SonoraTechnical](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sonoratechnical/32/20033_2.png) [@SonoraTechnical](https://discourse.nodered.org/u/SonoraTechnical)\
**Post date:** [5 May 2020 07:02 UTC](https://discourse.nodered.org/t/yf-s201-water-flow-sensor-node-red-gauge/26105/2 "2020-05-05T07:02:46Z")

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I have 4 of these same flow meters. I used to attach them to the UART version of the FLOW circuit produced by Atlas-Scientific, but that was using an Arduino DUE and the sample code on that site. The newest version of the EZO- FLO circuit supports i2c,but it does costs $40, which is a bit of money to spend to read a $10 flow meter.

I have a different flow meter in use at the moment attached to the EZO-FLO i2c circuit. However, in the coming weeks, I will configure the EZO-FLOW i2c circuit for the Yf-s201... I've downloaded the specs for it, but it's on a different computer so I can't provide them to you for a few days... You can search for them yourself .

I'm a big fan of the EZO-FLO i2c circuit because totalization and instantaneous flow using pulse counts is a bit CPU intensive..... With the EZO-FLO circuit you are offloading all of that.... Then you can just have your flow talk to the EZO-FLO using the Node-RED-contrib-i2c node.

This thread here has the flow used (though disabled...but it works when I hook it up).

> [@Aquarium Controller - Raspberry PI 4B Node-RED, Atlas-Scientific i2c Devices, NCD i2c Relay Board](https://discourse.nodered.org/t/aquarium-controller-raspberry-pi-4b-node-red-atlas-scientific-i2c-devices-ncd-i2c-relay-board/25839):
>
> Aquarium Controller, Pardon the Topic Title, but I wanted this Project to be found. This project has had many false starts as a baremetal project on ArduinoDue and later a UWP on RPI3B w/ Win10IoT. I was particularly impressed by the Atlas IoT Monitoring Software from Atlas-Scientific that runs on a Raspberry PI 3B and Windows10IoT for connecting to their i2c enabled sensors, devices and circuits. [Atlas-Scientific Atlas IoT Monitoring Software Link.](http://www.atlas-scientific.com/product_pages/atlas-iot.htm) This next effort was to create an alternat…

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