Potential E1.31 / WiFi mod for dumb strips & floods.

[martijnkooi]

Hi, sorry - my bad. Arduinos only have a 8 bit analog output (0 to 255) the ESPs / Wemos are 10bit (0 to 1023). An easy fix *4.

analogWrite(output_1_red, e131.data[channel_1_red -1] );

analogWrite(output_1_red, (e131.data[channel_1_red -1] *4));

I will try tonight! Many thanks sofar.
Did make some changes, will upload a working sketch if all works out!!

Thanks. Martijn


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[martijnkooi]

Hahaha, no problem dude

I tried the 4* multiplier. This gives me a proper 3.3v output.
This is however too low for the irf540 mosfet.
The led lights up but not very bright. I meassure 7V output as where it should be 12V.

Easiest way is put another arduino (nano) between the in- and output, but far from ideal.
Pretty stuck, is there a way to juice up the voltage from 3 to 5v?

[Barnabybear]

Hahaha, no problem dude

I tried the 4* multiplier. This gives me a proper 3.3v output.
This is however too low for the irf540 mosfet.
The led lights up but not very bright. I meassure 7V output as where it should be 12V.

Easiest way is put another arduino (nano) between the in- and output, but far from ideal.
Pretty stuck, is there a way to juice up the voltage from 3 to 5v?

The proper way is to use the correct MOSFET IRLB8721, if you really must cheat put a silicon diode between the ground on the Wemos and the ground of the FETs, Anode to the Wemos.

IMPORTANT when you power the Wemos you use the normal 5V terminal and the FET side of the diode not the ground terminal on the Wemos. What it does is make the ground of the Wemos 0.7V higher than the ground of the FET. Instead of the FET seeing 0 to 3.3V it sees 0.7 to 4V. As 0.7V is low enough to switch the FET off this doesn’t matter.

EDIT: ANODE to the Wemos.

[Lxkev]

This is really useful. Just wondering if some one could upload a circuit diagram of how to hook up led to a esp 8266?

Thanks

[Barnabybear]

This is really useful. Just wondering if some one could upload a circuit diagram of how to hook up led to a esp 8266?

Thanks

Hi, more than happy to. Can you give me / us an idea of what your wanting to drive with this (any link are good).

[Lxkev]

Going to try and drive a 5v led chip.

Uses a wemos mini board

[Barnabybear]

Hi, hand drawn schematic below. The 270R resistor is to protect the wemos outputs, if you don’t have one 330R or 220R will do. This switches the connection to ground (low side) so can be used for voltages greater than 5V if needed. There are 6 GPIOs that I would start with: 12, 13, 14, 15, 4 & 5. You can repeat this circuit for each GPIO / channel you wish to control; you may need current limiting resistors for the LEDs dependant on which you use.


Once you get some bits wired up if you need help with the sketch let me know.

IMG_0786.JPG

EDIT:
I didn't lable the pins on the FET.
Top = Drain.
Side = Gate.
Bottom = Source.

[Lxkev]

Thank you for the wiring diagram. I've got it hooked and working.

I'm trying to add the wifi manager code for fun. However because I deleted the code for the wifi config I get error frm this code:

/* Choose one to begin listening for E1.31 data */
//e131.begin(ssid, passphrase); /* via Unicast on the default port */
e131.beginMulticast(ssid, passphrase, universe); /* via Multicast for Universe 1 */

My SSID and passphrase is sorted by the wifi manager... Can anybody help me?

[KickenWing3000]

Just wanted to say thank you for the code. I'm using it to drive rudolph's 100w red nose with a mosfet and light up the reindeer with 8 relays.

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[Barnabybear]

Just wanted to say thank you for the code. I'm using it to drive rudolph's 100w red nose with a mosfet and light up the reindeer with 8 relays.

Sent from my SM-G930V using Tapatalk

Hi, thanks. Glad it was of use, can you put up some pics when you get chance please the 100W red nose has my interest.