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Forum Index : Microcontroller and PC projects : Micromite beta 7

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vasi

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Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 01:41am 20 Feb 2014
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I vote for both humidity and RFID sensors (those are used also in pigeon sport - homing pigeons), but I'm afraid that this will cost the RF comm. (maybe is better).

I would have liked to be able to send Geoff a pair of both NRF24L01+ and RFM12B transceivers (in this explicit case you can't implement blindly, without testing the functionality) but this is much over my financial possibilities .

Hobbit name: Togo Toadfoot of Frogmorton
Elvish name: Mablung Miriel
Beyound Arduino Lang
 
WhiteWizzard
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Joined: 05/04/2013
Location: United Kingdom
Posts: 2817
Posted: 02:12am 20 Feb 2014
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I can send RFM12B's to Geoff if required.

I agree with Vasi's hint - Is RF coms worth delaying until the PIC32MZ . . .??

For everything Micromite visit micromite.org

Direct Email: whitewizzard@micromite.o
 
paceman
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Joined: 07/10/2011
Location: Australia
Posts: 1329
Posted: 02:19am 20 Feb 2014
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The DHT22 temp/humidity sensor would be my first choice too.
Another popular one in a different vein is the Bosch BMP085 pressure sensor BMP085. It's I2C, cheap (eBay module around $3), ultra low power (mobiles, GPS etc), very accurate, 1.8-3.6v supply.

Greg

 
hitsware
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Joined: 23/11/2012
Location: United States
Posts: 535
Posted: 04:07am 20 Feb 2014
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> five firmware independant PWM outputs!

Are the frequencies as well as the duty cycles independent ?
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 04:26am 20 Feb 2014
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The PWM as i understand are divided in two groups. The PIC has two timers that are the basis for the PWM.
So two frequencies are available.

Microblocks. Build with logic.
 
atmega8

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Joined: 19/11/2013
Location: Germany
Posts: 722
Posted: 04:40am 20 Feb 2014
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I put a "reset or reboot" command on the whishlist.

Please before Christmas;-)

What is it good for?

Switching on/off my power supply for a reset is not so smart as just typing

"reboot"...

 
atmega8

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Joined: 19/11/2013
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Posts: 722
Posted: 04:45am 20 Feb 2014
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when we need very exact RTC's then we should consider the
RTC RV-3029 from the suisse Company from Micro Crystal switzerland!!

It is I2C driven and costs about 3-4€

http://www.microcrystal.com/images/_PDF/5_Real-Time-Clock_RV /rv-3029-c2.pdf
 
MicroBlocks

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Posted: 04:51am 20 Feb 2014
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I have been thinking about a reset/reboot command but i think it is better if you have control over one of the pins to reset the microcontroller. It would then also be able to work correctly if other hardware is connected to it that needs that reset signal.
Just connect the output pin to the reset line, maybe use a diode to prevent current going the wrong way.

You could also use the WATCHDOG command to accomplish a reboot by specifying a low value as its timeout.

That RTC is not really accurate at all if you read the datasheet.
Edited by TZAdvantage 2014-02-21
Microblocks. Build with logic.
 
BobD

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Joined: 07/12/2011
Location: Australia
Posts: 935
Posted: 05:27am 20 Feb 2014
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  atmega8 said   when we need very exact RTC's then we should consider the
RTC RV-3029 from the suisse Company from Micro Crystal switzerland!!

It is I2C driven and costs about 3-4€

http://www.microcrystal.com/images/_PDF/5_Real-Time-Clock_RV /rv-3029-c2.pdf

That one is not so good. The datasheet talks about 6 to 8 ppm accuracy. If you look at the DS3231N it does 2 ppm from 0 to 40 degrees C and 3.5 ppm with an extended range and it has a user loadable compensation register. And there may now be better RTCs available than that.
 
BobD

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Joined: 07/12/2011
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Posts: 935
Posted: 05:34am 20 Feb 2014
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Someone mentioned usb keyboard support earlier. I have successfully used the ps2 to usb dongles that come with Logitech keyboards. Not sure if they are still provided with those keyboards now though. Last time I bought a keyboard was several years back.
 
CircuitGizmos

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Joined: 08/09/2011
Location: United States
Posts: 1425
Posted: 05:50am 20 Feb 2014
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  Geoffg said  
I know that I am going to regret asking this but is there any other device that would benefit from having support built into MMBasic?


MP3!


*snort!*


.
Micromites and Maximites! - Beginning Maximite
 
CircuitGizmos

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Joined: 08/09/2011
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Posts: 1425
Posted: 05:53am 20 Feb 2014
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Microchip has UNI/O, but I perceive it as being very uncommon. I think it is limited to EEPROM.

I have some sample chips but have not even fired them up.Edited by CircuitGizmos 2014-02-21
Micromites and Maximites! - Beginning Maximite
 
hitsware
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Joined: 23/11/2012
Location: United States
Posts: 535
Posted: 06:31am 20 Feb 2014
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> I know that I am going to regret asking this
> but is there any other device that would benefit
> from having support built into MMBasic?

MIDI
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3815
Posted: 07:06am 20 Feb 2014
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A USB hub would allow many cheap USB devices to be used: USB WiFi, USB BT, etc.

But USB host code is horrid! Are there any USB hubs that are very cheap and also offload all that pain?

John
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 07:14am 20 Feb 2014
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I second the wish for MIDI.

It should only be a serial port with a 31.25K baudrate, right? (and an optocoupler of course, external parts are minimal)
That should enable some cool control surfaces?
Edited by TZAdvantage 2014-02-21
Microblocks. Build with logic.
 
atmega8

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Joined: 19/11/2013
Location: Germany
Posts: 722
Posted: 07:18am 20 Feb 2014
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Ok, the datasheet doesn't lie;-)

The RV-3029 is also a little beast, not so easy to get it running.

So DS3231N is number one now, as long there is not another better suited RTC.

Let's start the RTC BEST OFF battle....



  BobD said  
  atmega8 said   when we need very exact RTC's then we should consider the
RTC RV-3029 from the suisse Company from Micro Crystal switzerland!!

It is I2C driven and costs about 3-4€

http://www.microcrystal.com/images/_PDF/5_Real-Time-Clock_RV /rv-3029-c2.pdf

That one is not so good. The datasheet talks about 6 to 8 ppm accuracy. If you look at the DS3231N it does 2 ppm from 0 to 40 degrees C and 3.5 ppm with an extended range and it has a user loadable compensation register. And there may now be better RTCs available than that.
 
BobD

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Joined: 07/12/2011
Location: Australia
Posts: 935
Posted: 08:26am 20 Feb 2014
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Dietmar, not saying that the DS3231N is the best but it's getting there. It is also register compatible (registers 0 to 6) with the popular DS1307 for basic time and date functions. The DS323x family has a number of chips with varying accuracy and functionality (I2C, SPI, battery backed SRAM). It is important to do your research if intending to use one of these.Edited by BobD 2014-02-21
 
atmega8

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Joined: 19/11/2013
Location: Germany
Posts: 722
Posted: 09:26am 20 Feb 2014
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THX, BobD..

i will study some datasheets now ;-)
 
CircuitGizmos

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Joined: 08/09/2011
Location: United States
Posts: 1425
Posted: 09:32am 20 Feb 2014
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Some IR modules have an open collector output. They can still be used with the IR receive function of the micromite, you just need a 10k pull-up resistor on the data line. Pin 16 on the 28-pin chip. (This is the wakeup line.)
Micromites and Maximites! - Beginning Maximite
 
Zonker

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Joined: 18/08/2012
Location: United States
Posts: 761
Posted: 01:19pm 20 Feb 2014
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MIDI would be cool...

But the cool part about that is adding an "underground" multi-track sequencer that can be controlled very simply from foreground code and a DIM array..! Maybe for the FTF Mite with touch... Could make MIDI beat-box, controller , practice tracks recorder... (sweet)...

 
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