Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

Arduino Due for SPI TFT screen

Nick Willis last edited by

I've been trying to find the best hardware setup to have a TFT screen scene controller for MySensors.
I've tried several TFT shields for the mega but all the ones I've found have no way to turn off the backlight for the screen and I don't want it burning on 24/7. I eventually found a good one that has a SPI interface with seperate backlight power pin.
I then discovered it needs 3.3v logic so I tried using level shifters with the mega which worked but I wasn't happy with the mass of cabling I ended up with. I know I could design and build a custom shield but I really was looking for a more 'off the shelf' solution.

So then I found the Due - runs nicely at 3.3v, has a tidy SPI port and a bit more power than the mega. But it won't work with MySensors!
I've found a few old threads discussing the Due like this one (https://forum.mysensors.org/topic/4750/support-for-arduino_sam-e-g-arduino-due). I tried doing as the thread says to allow the SAM architecture but it just wouldn't work, lots of compile errors. Does anyone have the Due working under MySensors who could share what they did to get it going? The radio needs to go on soft SPI too I'd guess.

Anyone who can help here? Starting to acquire a growing pile of hardware of which none of it quite fits together as I want!
Reply Quote 0
1 Reply Last reply

1
Posts

87
Views

Suggested Topics

Can't find parent after changing NRF24L01+ radio
Troubleshooting • • flix

1

0
Votes

1
Posts

19
Views

No one has replied
RFM69 Range issues
Troubleshooting • • bjornhallberg

34

0
Votes

34
Posts

255
Views

@evb To get the SNR to the ballpark you'll need to do the following..... Tune to a frequency close to the one you want that has no signal. Click the cog or three horizontal lines top left (if using the latter then click 'radio'. Select 'sensitive' and move the gain slider all the way to the left. To the right of the spectrum display adjust the 'offset' so that you can see the noise at the bottom of the spectrum display. Move the gain slider to the right until the noise floor jumps up about 5dB using the scale on the left of the display. Tune to a constant signal and contimue to move the gain slider to the right. Use your eyes and ears to detect changes in the sound of the signal. You want it as clear as possible. The verticla blue graph on the right of the spectrum display will show signal to noise ratio. It takes a little while to catch up with you so work slowly. Eventually you will get good signal to noise ratio with a high signal to noise ration. Often as the gain goes higher the noise floor increases and this will degrade the signal, hence the need to find the 'sweet spot' where the signal benefits most from the gain amp whilst the noise is still at a low level. Hope that makes sense. Any touble and I will try and ecplain it differently. You are amining for the biggest gap between signal peak and noise.
Temperature serial sketch
Troubleshooting • • Olaf Jacobs

13

1
Votes

13
Posts

118
Views

@skywatch I do have the resistor in place now, like mentioned it works and still works.
Sensebender micro failing with funny characters
Troubleshooting • • flix

5

0
Votes

5
Posts

63
Views

@alexsh1 Thanks for the comment, there is some good tips there! I'll try re-soldering some of the connections. Funnily enough, I had wanted to increase the transmission power on 2 of my nodes (the furthest away from the controller) including this one here, and had added that at the top of my sketch. After uploading the sketch, the serial monitor still displayed a lot of garbage, but the node started successfully transmitting temperature and humidity values! So I've put the batteries back in and hung it up in the room, and it has been running pretty good so far. But I have my doubts how long it will last, given I didn't actually fix the serial output issue... On another note, is there anyway to confirm that the transmission power has been increased? I added #define MY_RF24_PA_LEVEL RF24_PA_MAX at the top of my sketch, just after defining the radio type, but it doesn't seem to have improved my transmission success rate (I realise there are lot of other factors affecting transmission success, but just wanted to check)...
15 blinds driver at Mega2560 - Domoticz synchronisation problem
Troubleshooting • • eferemen

2

0
Votes

2
Posts

19
Views

You could send the blinds statess to Domoticz in the presentation method. My experience is that my setup doesn't like it when I send a lot messages to the gateway. So I use some small delays between each message I send from the node to the gateway, I didn't have time to look at your sketch. But here's some pseudo code: void presentation() { ... // the presentation code goes here. for ( int = 0; i < BLINDS_COUNT; i++ ) { send( message for blinds i, state of blinds i ); delay( 50 ); // or do less it's a bit of trial and error. } } In your case using random delays might be better, because you send 15 states with a delay of 50ms. So it takes at least 750ms to send all values. Adding the delay will also give other nodes time to interact with Domoticz.
Is it possible to request sensor status (via MQTT)?
Troubleshooting • • joaoabs

2

0
Votes

2
Posts

50
Views

"Usually" is the correct term. You can request whatever you want using MQTT, but you need to handle the response manually inside the receive() function. This isn't an automatic internal process like the echo or ack response. void receive(const MyMessage &message) { if (message.getCommand() == C_REQ) { switch (message.getSensor()) { case 10: // Send SSR 1 state break; case 11: // Send SSR 2 state break; case 20: // Send temperature sensor value break; case 40: // Send humidity sensor value break; default: break; } } } Note: It's best to not send a message from within receive() as it can cause all sorts of weird stuff, including recursive loops. Preferably, you'd set a flag and handle everything else in the main loop.
Compilation error when using LowPower.h library with MySensors
Troubleshooting • • SuperNinja

3

0
Votes

3
Posts

39
Views

great thank you for your answer!
Killing Nanos, one after the other
Troubleshooting • • 3nibble

10

0
Votes

10
Posts

98
Views

@3nibble Diode is bad. You can shorting it. But then you can power this Arduino only from USB or from +5V in the same time!!! Not both !!! This can damage your USB port.

Arduino Due for SPI TFT screen

Suggested Topics

Can't find parent after changing NRF24L01+ radio
Troubleshooting • • flix

RFM69 Range issues
Troubleshooting • • bjornhallberg

Temperature serial sketch
Troubleshooting • • Olaf Jacobs

Sensebender micro failing with funny characters
Troubleshooting • • flix

15 blinds driver at Mega2560 - Domoticz synchronisation problem
Troubleshooting • • eferemen

Is it possible to request sensor status (via MQTT)?
Troubleshooting • • joaoabs

Compilation error when using LowPower.h library with MySensors
Troubleshooting • • SuperNinja

Killing Nanos, one after the other
Troubleshooting • • 3nibble

233
Online

9.9k
Users

10.4k
Topics

107.5k
Posts

Arduino Due for SPI TFT screen

Suggested Topics

Can't find parent after changing NRF24L01+ radio Troubleshooting • • flix

RFM69 Range issues Troubleshooting • • bjornhallberg

Temperature serial sketch Troubleshooting • • Olaf Jacobs

Sensebender micro failing with funny characters Troubleshooting • • flix

15 blinds driver at Mega2560 - Domoticz synchronisation problem Troubleshooting • • eferemen

Is it possible to request sensor status (via MQTT)? Troubleshooting • • joaoabs

Compilation error when using LowPower.h library with MySensors Troubleshooting • • SuperNinja

Killing Nanos, one after the other Troubleshooting • • 3nibble

233Online

9.9kUsers

10.4kTopics

107.5kPosts

Can't find parent after changing NRF24L01+ radio
Troubleshooting • • flix

RFM69 Range issues
Troubleshooting • • bjornhallberg

Temperature serial sketch
Troubleshooting • • Olaf Jacobs

Sensebender micro failing with funny characters
Troubleshooting • • flix

15 blinds driver at Mega2560 - Domoticz synchronisation problem
Troubleshooting • • eferemen

Is it possible to request sensor status (via MQTT)?
Troubleshooting • • joaoabs

Compilation error when using LowPower.h library with MySensors
Troubleshooting • • SuperNinja

Killing Nanos, one after the other
Troubleshooting • • 3nibble

233
Online

9.9k
Users

10.4k
Topics

107.5k
Posts