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Forum Index : Microcontroller and PC projects : Micromite beta 7
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| hitsware Guru  Joined: 23/11/2012 Location: United StatesPosts: 535 |
> It should only be a serial port with a 31.25K baudrate, right? Right. The hardware UART will work, but it would be elegant to have a MIDIOUT command. I.E. MIDIOUT (byte1,byte2,byte3) |
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| SteveP Newbie  Joined: 21/03/2013 Location: United StatesPosts: 19 |
Sparkfun now sells VKey Voltage Keypad 3x4 as part PRT-12080. It uses a constant current source and user comments discuss temperature effects. https://www.sparkfun.com/products/12080 For LCD with fewer pins, serial communication can be used and Newhaven Display makes relatively inexpensive ones but it does then use up one of the two serial ports. So maybe include support for software serial ? |
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| viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
MicroMite Cell phone... Works great - can make and receive voice calls using headset, best part is playing with SMS to control things... So far I can tell you the keyboard routine works great, the LCD works great using 2004A, serial works. This thing is great! Thanks Geoff 
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| JohnL Senior Member  Joined: 10/01/2014 Location: SeychellesPosts: 128 |
A quick search on ebay for I2C LCD display. http://www.ebay.com.au/sch/i.html?_trksid=m570.l3201&_nkw=lc d+display+i2c&_sacat=0 Lots of options, for I2C adapters, Displays with I2C adapters. Don't know the difference in software to drive display direct Vs I2C? But I agree with previous posters that at the moment direct connection of LCD and Keypad is wasting a lot of micromite pins. |
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Lou Senior Member Joined: 01/02/2014 Location: United StatesPosts: 229 |
But I agree with previous posters that at the moment direct connection of LCD and Keypad is wasting a lot of micromite pins.
Seems like the reason for the uMite 44. Use 8 pins for keypad, 6 pins for LCD, you still have the original 19 pins you started with on the uMite 28. That's not bad, and besides you can use the IR receive instead of the keypad in many cases using only 1 pin. Geoff, I like the temperature/humidity combo others have described. I miss the CLS in the uMite editor but F4 ESC works. Thanks for the improvements in beta 7. I like the ultrasonic touch, a possible inexpensive aid for the blind. Lou Microcontrollers - the other white meat |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
@ viscomjim - what cellphone module are you using, where did you get it, and what did it cost? I have something like this in mind, and as the commercial SMS module is $400 a pop, I would be VERY interested in your module, especially as you seem to have got it going without much pain, so it would seem. I would need to see if that module can talk to the New Zealand cellphone networks, but if you would please link me to it.... Smoke makes things work. When the smoke gets out, it stops! |
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| viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
Hi Grogster, The GPRS/GSM module is called Efcom pro. The manufacturer is Elecfreaks.com It also comes as a shield (for maximite use). I paid $45.00 for it on ebay new. It uses the SIM900 module and simple AT commands like a hayes modem did back in the day. It will need a sim card to operate. I got a month to month cell plan with talk and SMS only, no data to keep it cheap ($5.00 month), however the unit can do data also if you want web connectivity. Using caller ID, you can do a simple operation (like open a gate) and never answer the phone, or use SMS and do whatever your heart desires. Make sure to use COM1 as it is 5v tolerant. I powered mine off a 5v 2A separate wall wart to play with as the data sheet says it can have up to 2 amp spikes once in a while. I guess larger cap could help with a smaller supply. |
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| plasma Guru Joined: 08/04/2012 Location: GermanyPosts: 437 |
sometimes ago i used a gsm module with the maximite . its really great and provides a lot of gsm info if you have the right AT commans for. i use a 2,5 A power station for because the module needs moore power if the conection is miserable. ( works at home but not in my garage) . also it needs antenna tuning . ill never tested internet connection with but for sms its great. its a little bit like " build your own iphone" because u can also play games with the maximite if you will. hahaha... |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
geoff: see my last two posts in the original beta testing thread regard a few errors in the beta 7 manual and how to combine lcd and keypad on the same set of pins. rob :-) |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3196 |
Got them thanks Rob. The "combine lcd and keypad" will take a little thought. The keypad command sets the rows to inputs with pullups enabled and the columns as open collector outputs - neither are easily compatible with the LCD. Geoff Geoff Graham - http://geoffg.net |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
the simplest solution of combining LCD and KEYPAD pins would be to: 1) swap the column/row functions so that in both 4x4 and 3x4 cases there are 4 pins that are driven, 2) add a diode in series with each of the 4 driven pin, cathode end to the pin, 3) configure driven pins as DOUT (ie, not open collector), 3) connect d4..d7 directly to the driven pins. the diodes would cause the driven pins appear as open-collector to the keypad, and prevent simultaneously pressed keys interfering with writes to the LCD module. combined functionality could be exposed as an extension to the LCD command: LCD INIT d4, d5, d6, d7, rs, en, var, int, c1, c2 [, c3 [, c4]] at the same time, it could be useful for some applications to also update the keypad functionality so that c3 is optional in the case of using a 2x4 keypad. with a combined LCD + KEYPAD, 1x4 may even be a combination of use in some applications. btw, you might like to look up "charlieplexing" using google. it allows 12 keys to be scanned with just 4 pins, 42 keys with just 7 pins, etc. the downside is that each key requires a series diode. the system was originally designed for driving LEDs, which provided the diodes for 'free'. it is neat, especially if someone were want to attach a complete set of alpha-numeric keys to a micromite, but may be a nightmare to code for! rob :-) |
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| MOBI Guru Joined: 02/12/2012 Location: AustraliaPosts: 819 |
If you want a complete set of alpha numeric keys as data input, why not just use i2c direct then coding is dead simple - just a i2c read command. I have a ps2 to i2c module in my junk box if any interest. David M. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Awesome - thanks a bunch for replying.  SIM cards are widely used here in NZ, and I am pretty sure the SIM900 will work as it is a quad-band cellphone module, but I will, naturally, need to check before I get too carried away. They are roughly $350 cheaper then the commercial unit I was going to use, so the cost saving alone makes it worth experimenting with.
Smoke makes things work. When the smoke gets out, it stops! |
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| JohnL Senior Member Joined: 10/01/2014 Location: SeychellesPosts: 128 |
Geoff quick question about Ds18b20 temp sensor function. Sensor has resolution capability of 9-12 bits. Current fixed resolution is 0.25 degreesC, this should be OK for most general use. However, for more sensitive/precise application 12 bits would give 0.06 degC. Do you have an option in Micromite firmware for resolution to be user specified? For example DS18B20(pin, resolution)? Regards JohnL |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
i'm lead to believe that the DS18B20 read routine takes around 200ms to return, during which interrupts may be lost. are there any other functions that similarly risk losing interrupts? with the DS18B20 this could be avoided by having an extension to the function that returns a 'completed' flag, thus the following code example: DO temperature = DS18B20(pin, done) LOOP UNTIL done PRINT "Temperature: " temperature the logic would be that upon first call to DS18B20 a conversion would be initiated and the function would immediately return with done set to FALSE. subsequent calls would similarly return with done set FALSE until the conversion is completed. at that point done would be returned set TRUE and the function would return the read temperature. this would be compatible with the existing syntax, which would still introduce the 200ms delay when the done flag is not specified. rob :-) |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3196 |
Thanks fellows but my aim with the DS18B20 was to make it easy to use. Yes, I could have added options for improved resolution or a completion flag but that would have confused the casual user as both need inside knowledge of the DS18B20 to understand the consequences of using the options. I figured that if someone was technically adept to need these features they could drive the DS18B20 via BASIC anyway (there is a program in the MMBasic library to do just that). Rob, a number of the "high level" functions will take some time, for example the IR transmit command. In general BASIC the only command that will block interrupts for an appreciable time is the INPUT command. Geoff Geoff Graham - http://geoffg.net |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Missing word in manual Beta 7, page 11. Just below the mention of Jim's MMEdit program, it reads: Missing the word "be" between never and lost. Smoke makes things work. When the smoke gets out, it stops! |
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jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Here is a little bit of code for the UMite that will allow the above option GetTemp 14, Temp, &H7F Print "The temperature is:" Temp '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Subroutine to get the temperature from a Dallas DS18B20. ' Usage GetTemp (Pin number of DS18B20), (Temperature Variable), (Resolution) ' Resolution Table (Resolution Variable) ' &H1F = 9 bits 93.75ms Conversion Time ' &H3F = 10 Bits 187.5ms Conversion Time ' &H5F = 11 Bits 375ms Conversion Time ' &H7F = 12 Bits 750ms Conversion Time ' Temperature of 127 will be displayed ' in the case of a sensor fault '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Sub GetTemp (PinNbr, Value, Resolution) Local TH, TL, b, t OneWire Reset PinNbr ' reset OneWire Write PinNbr, 2, 5, &HCC, &H4E, &H00, &H00, Resolution OneWire Write PinNbr, 1, 2, &HCC, &H44 t=Timer Do If Timer - t > 1000 Then Error "Sensor Error" OneWire Read PinNbr, 4, 1, b ' Conversion status Loop Until b = 1 OneWire Write PinNbr, 1, 2, &HCC, &HBE OneWire Read PinNbr, 2, 2, TL, TH Value = ((TH And &b111) * 256 + TL) / 16 If T2 And &b1000 Then Value = -Value ' adjust if negative End Sub Sample output The temperature is: 19.4375 Hope this helps Jman |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6102 |
Error in the help file, Page 40: OPTION BREAK 4 will set the break key to the CTRL-B key). should read OPTION BREAK 2 will set the break key to the CTRL-B key). or OPTION BREAK 4 will set the break key to the CTRL-D key). Jim VK7JH MMedit MMBasic Help |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3196 |
Thanks Jim. Geoff Graham - http://geoffg.net |
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