@mikeyh Hi Mike,

Monarco HAT is grounded through Raspberry Pi (via 40 pin header). For complex grounding you should also ground GND output of power supply used to power Monarco HAT and Monarco HAT metal case. Could you please try it?

Cheers,
Tomas

@fabio
add poznámka: Je to vidět z výše zmíněného obrázku. Jakmile mezi DOUT a GND připojíte odpor a DOUT bude mít hodnotu OFF, vznikne napěťový dělič. Podle připojeného odporu dopočtete napětí, které bude mezi DOUT a GND. Nicméně procházející proud bude stále pravděpodobně nedostatečný. DOUT je prostě dělaný tak, aby se spínal s externím napětím.

Buď si za 12V předřaďte odpor tak, aby Vám vycházelo požadované napětí (5V) , nebo použijte externí zdroj 5V nebo sežeňte 12V ventilátor. Výpočty a konečnou volbu nechám na Vás.

S pozdravem,
Reitinger

You are welcome 🙂

Hi Mike,

there is also one post at old REXYGEN forum which might help you:
https://www.rexcontrols.cz/forum/viewtopic.php?id=17

Cheers,
Tomas

Hi Mike,

I wasn't 100% right, sorry for that.

It is prohibited to use both flags for AI at the same time by the compiler. The solution is not that straightforward however it is possible:

use just "MNR_AI1" flag to set the current mode use SDC write flag, address 0x00A - bits 01 and 02 (see docs: https://github.com/monarco/monarco-hat-documentation/blob/master/Monarco_HAT_SPI_Protocol.md#service-channel-register-description) when in current mode you need to manually convert the value by following formula 10V = 52.475 mA

If you need any additional help, let me know.

Cheers,
Tomas

@jaroslav_sobota

Hello,

Selecting the HW clock seems to fix the problem, I did try this as my first solution because it was obvious to try and get the time from the Real-time circuit, but I could swear it had some issues. Must have been some other mistake I fixed along the way.

Anyway, everything works as intended, thanks for the swift support with the command, it proved the time was set correctly just read from the wrong source.

Hi Jaroslav,

No, not causing an issue as such. Setting the LIN block in such a way fixes the problem and allows the fan to operate correctly.

Cheers

Mike

Hi Jaroslav,

That’s awesome, I will try this out during the week.

I’ll let you now how it goes.

Cheers

Mike

Hi Jaroslav,

Thanks for the reply, yes this was the case. With a bit of scaling added it works fine, only with slight loss of resolution. Not enough to cause issues tough.

Cheers

Mike

@jaroslav_sobota no problem 🙂

Hi Mike,
thanks for clarification. I have no experience with that, but the Maxim MAX1721x with 1-Wire interface seems to be ideal for such a project with the Monarco HAT.

Jaroslav

@mikeyh Did you mean analog inputs? The accelerometer outputs range from 0 to 3.3V... In general, it will work. Note that you'll not fully use the resolution of the A/D converter on the Monarco HAT and you'll be limited to 2 axes as the Monarco HAT has 2 analog inputs.

If you meant digital inputs indeed, then it won't work. Logic high voltage of the DIs on the Monarco HAT is 3.5 V to 30 V.

Hope this helps, let me know.

Jaroslav