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Comment on ATtiny25 Basic VCO, RC oscillator overclocking and testing frequency pickup by ATtiny25 Basic VCO, RC oscillator overclocking and testing frequency pickup | Make, Electronics projects, electronic Circuits, DIY projects, Microcontroller Projects - makeelectronic.com

Tue, 18 Jun 2013 16:56:37 +0000

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Comment on nRF24 Multi-Network – Allowing for 255 addresses by Marlos

Marlos — Tue, 18 Jun 2013 14:45:35 +0000

Dear Alex,

I am trying to do a network that allows a receiver to read the data from transmitters that send the data of the sensors. Each nrf24 sends the sensor data to the receiver, that actuates like a central. Do you think it’s possible to do this based on the code made by you? Your code helped a lot. I am using a msp430, from Texas Instrument.

Regards,
Marlos

Comment on Fun with 8×8 LED Matrix by Alex

Alex — Tue, 18 Jun 2013 09:15:21 +0000

One way would be to store each letter in the flash using PGM.

Another method is to store each letter as 8 bytes with each byte representing which LED to light up. If you check my AT Mini Matrix Ctrl code I do this in the function append_text_Matrix (which also uses PGM too).

The setup.c file in AT Mini Matrix Ctrl has the letter to LEDs array:
prog_uchar ledLetters[26][8] PROGMEM = {
{24,8,20,20,20,28,34,119}, // A
…

Comment on Inside the Tenda 8 Port Fast Ethernet Switch by Steve

Steve — Mon, 17 Jun 2013 20:30:55 +0000

I’ve got one of these as well. But mine had “7.5VAC” printed on the case. I seem to have misplaced it…. so when I opened mine up and saw the diode bridge, cap rating, and a DC-DC converter, I supplied it with 12VDC and moved on with my life. Still working….

Comment on Fun with 8×8 LED Matrix by allysa

allysa — Mon, 17 Jun 2013 13:45:35 +0000

Alex i have lack of RAM issue i’ve checked and it takes a lot of RAM because i’ve tried to check array one by one with IF function, :

if (s==’A'){LEDs[x][y+16] = letterA[x][y];}
if (s==’B'){LEDs[x][y+16] = letterB[x][y];}
if (s==’C'){LEDs[x][y+16] = letterC[x][y];}
if (s==’D'){LEDs[x][y+16] = letterD[x][y];}
if (s==’E'){LEDs[x][y+16] = letterE[x][y]; }
if (s==’F'){LEDs[x][y+16] = letterF[x][y]; }
if (s==’G'){LEDs[x][y+16] = letterG[x][y]; }
if (s==’H'){LEDs[x][y+16] = letterH[x][y]; }
if (s==’J'){LEDs[x][y+16] = letterJ[x][y]; }
if (s==’K'){LEDs[x][y+16] = letterK[x][y]; }
if (s==’L'){LEDs[x][y+16] = letterL[x][y]; }
if (s==’M'){LEDs[x][y+16] = letterM[x][y]; }
if (s==’N'){LEDs[x][y+16] = letterN[x][y]; }
if (s==’O'){LEDs[x][y+16] = letterO[x][y]; }
if (s==’P'){LEDs[x][y+16] = letterP[x][y]; }
if (s==’Q'){LEDs[x][y+16] = letterQ[x][y]; }
if (s==’R'){LEDs[x][y+16] = letterR[x][y]; }
if (s==’S'){LEDs[x][y+16] = letterS[x][y]; }
if (s==’I'){LEDs[x][y+16] = letterI[x][y]; }
if (s==’T'){LEDs[x][y+16] = letterT[x][y]; }
if (s==’U'){LEDs[x][y+16] = letterU[x][y]; }
if (s==’V'){LEDs[x][y+16] = letterV[x][y]; }
if (s==’W'){LEDs[x][y+16] = letterW[x][y]; }
if (s==’X'){LEDs[x][y+16] = letterX[x][y]; }
if (s==’Y'){LEDs[x][y+16] = letterY[x][y]; }
if (s==’Z'){LEDs[x][y+16] = letterZ[x][y]; }

can you tell me another methods to check letter and then calling the array associated with it? btw, thank you Alex for your help.

Comment on Fun with 8×8 LED Matrix by Alex

Alex — Sat, 15 Jun 2013 09:33:02 +0000

Nice

Comment on Fun with 8×8 LED Matrix by allysa

allysa — Fri, 14 Jun 2013 22:54:51 +0000

I Modified your code, and works now with two of 8×8 dot matrix led, check my video at:
http://youtu.be/skBDsUYHXIY
Thanks Alex, soon i will try to add more shift register and matrix led to make 24×8 or more, once again thanks for your help.

Comment on Fun with 8×8 LED Matrix by Alex

Alex — Wed, 12 Jun 2013 14:44:31 +0000

Hi Allysa, to add on an extra 8×8 matrix, you would need to expand the variables like “LEDs”, etc. Then in the lightLED you need to double everything there and add two more shiftOut calls. I would try try focusing on the lightLED function and have it only lighting up single LEDs at a time until you know both 8×8 matrixs work.

Comment on Fun with 8×8 LED Matrix by allysa

allysa — Wed, 12 Jun 2013 08:37:43 +0000

hi alex, your project is very awesome. thanks for your sharing, i have tried your code by using 2 IC 74HC595 without using darlington array ULN2003, and i modified your code so it can work without darlington array. its work like a charm. but can you help me? what should i change in your code if i want to add more 8×8 dot matrix? thank you so much alex for your help.

Comment on Using the nRF24L01 wireless module by Alex

Alex — Mon, 10 Jun 2013 14:34:17 +0000

Hi Jony,
My email is alex@insidegadgets.com