Inverting outputs

[Lusitan-o]

Could someone please tell me were to modify the code to have the outputs inverted? I'm a beginner and any baby steps would be appreciated. I need to initialize the outputs HIGH when chip first powers on and a low to turn ON. I have some relays connected to the mcp23017 that use inverted outputs and require LOW on the pin to be ON and a HIGH on the pin to be OFF. I've tried to use a flow to inject once at start 1 to turn all outputs OFF, but when the node-red starts it momentarily turns the relays ON.

Thanks.

[willhey]

Hi, I can't recreate you scenario. The MCP23017 will retain it's state until told otherwise by the node So restarting Node-red has should not momentarily turn the output on.
How are you using the MCP23017 - is then any other circuitry involved Please can you attach your flow

[Lusitan-o]

Hi willhey, Thanks for your reply. As far as I know, there are two nodes for Microchip MCP23017 one is the node-red-contrib-mcp23017 that is 2 years, 3 months and I can't seem to be able to install it and the other is node-red-contrib-mcp23017chip, that it installs fine and works. For a end user point of view there should be no difference on the flow except that node-red-contrib-mcp23017 has the outputs inverted. Because I'm dealing with a rack of OPTO22 G4PB16H solid state relays connected to the MCP23017 I need to have the outputs inverted. In other words, instead having a Low I need a High when the node loads or inverted outputs.

Here is the test flow were I try to bring the outputs to high state :

[{"id":"3b50972a.ea44d8","type":"mcp23017output","z":"e4703339.23974","name":"Bit 0","chip":"6082953.a63a06c","bitNum":"0","invert":true,"x":338,"y":119,"wires":[[]]},{"id":"8c0347e6.509b88","type":"inject","z":"e4703339.23974","name":"All Off","topic":"","payload":"1","payloadType":"num","repeat":"","crontab":"","once":true,"x":151,"y":48,"wires":[["3b50972a.ea44d8","1ac25a0f.1592f6","ee6067f0.573dd8","27187596.f16f4a","7b93cc7f.cdd284"]]},{"id":"e46c9f0.e70666","type":"inject","z":"e4703339.23974","name":"Relay 1 - ON","topic":"0","payload":"","payloadType":"num","repeat":"","crontab":"","once":false,"x":122,"y":117,"wires":[["3b50972a.ea44d8"]]},{"id":"1ac25a0f.1592f6","type":"mcp23017output","z":"e4703339.23974","name":"Bit 1","chip":"6082953.a63a06c","bitNum":"1","invert":true,"x":336,"y":193,"wires":[[]]},{"id":"ee6067f0.573dd8","type":"mcp23017output","z":"e4703339.23974","name":"Bit 2","chip":"6082953.a63a06c","bitNum":"2","invert":false,"x":331,"y":252,"wires":[[]]},{"id":"27187596.f16f4a","type":"mcp23017output","z":"e4703339.23974","name":"Bit 3","chip":"6082953.a63a06c","bitNum":"3","invert":false,"x":327,"y":341,"wires":[[]]},{"id":"7b93cc7f.cdd284","type":"mcp23017output","z":"e4703339.23974","name":"Bit 4","chip":"6082953.a63a06c","bitNum":"4","invert":false,"x":327,"y":411,"wires":[[]]},{"id":"260d295b.3f2196","type":"inject","z":"e4703339.23974","name":"Relay 2 - ON","topic":"0","payload":"","payloadType":"num","repeat":"","crontab":"","once":false,"x":111,"y":182,"wires":[["1ac25a0f.1592f6"]]},{"id":"3943300e.c8b43","type":"inject","z":"e4703339.23974","name":"Relay 4 - ON","topic":"0","payload":"","payloadType":"num","repeat":"","crontab":"","once":false,"x":114,"y":288,"wires":[["27187596.f16f4a"]]},{"id":"17ffe964.f05c37","type":"inject","z":"e4703339.23974","name":"Relay 3 - ON","topic":"0","payload":"","payloadType":"num","repeat":"","crontab":"","once":false,"x":109,"y":234,"wires":[["ee6067f0.573dd8"]]},{"id":"95144d6e.b8afe","type":"inject","z":"e4703339.23974","name":"Relay 5 - ON","topic":"0","payload":"","payloadType":"num","repeat":"","crontab":"","once":false,"x":117,"y":338,"wires":[["7b93cc7f.cdd284"]]},{"id":"6082953.a63a06c","type":"mcp23017chip","z":"","addr":"0x21","interval":"100"}]

Thanks for any help.

On Sun, Jan 7, 2018 at 11:27 AM, willhey notifications@github.com wrote:

Hi, I can't recreate you scenario. The MCP23017 will retain it's state until told otherwise by the node So restarting Node-red has should not momentarily turn the output on. How are you using the MCP23017 - is then any other circuitry involved Please can you attach your flow

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[Fraenkiman]

Hello Willhey,

apparently I have the same problem as Lisitan-o. It would be great if they look at my flow.

Actual state: after pressing the first "ui_switch", all 16 relays are activated.

DESIRED state: after pressing the first "ui_switch", only the relay connected to the "ui_switch" goes.

Reproducibility: Call the board, press one of the 16 "ui_switch".

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"369043c9.20407c", "type": "ui_button", "z": "1bef20e4.475dff", "name": "", "group": "c89de1f.ba6b22", "order": 17, "width": 0, "height": 0, "passthru": false, "label": "RESET", "tooltip": "", "color": "", "bgcolor": "", "icon": "", "payload": "true", "payloadType": "bool", "topic": "", "x": 420, "y": 620, "wires": [ [ "4ec37644.fab738", "df09220d.11dca", "802ba994.19ad58", "c02a7bad.1563a8", "c1461502.ce87f8", "4fe9069d.bae858", "2c300d46.128322", "c9194555.b7e588", "5d8c5971.ed3b28", "49c79fbb.5bcbe", "1c806a12.7acd66", "1b2c7e9d.bc16a1", "4fd40891.a06b88", "bcadfbd0.eea168", "310c1dcb.1f3872", "6c7b6c0c.6983e4", "fb55b74c.4a7a98", "97b24a01.a20388", "6c5ed1fb.bd3bf", "adf79e3d.92715", "34e2b86.cabb448", "922b6e79.92edc", "8f89323e.48f57", "46f1aab7.60fe54", "d25c789.ad51888", "61bf0655.74ddf8", "74a6c031.03c8b", "5dda9092.28de3", "df8c7fee.00eb4", "966b1e28.e4f57" ] ] } ]

[Fraenkiman]

Hello @Lusitan-o

did you get to your issue (MCP23017)? Are you still using this node? If so, I would be happy about your solution.

Hello @willhey

Do you have a solution or did you discover a mistake in my flow (my comment from November 24th, 2019)?

Best regards from Germany

[PizzaProgram]

I've created a complete rewrite of the code. If @willhey accepts my Pull Req., there will be a new CheckBox : Invert.

Until than, you can manually install / update the source code from here: https://github.com/PizzaProgram/mcp23017chip