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Hello All,
I need to design current stabilized LED drivers. (Requiring very low noise, low thermal drift of LED currents)
Main supply voltage is 15V dc
LED currents are about 500mA each. I also need to adjust the LED currents btw 200 .. 600mA individually for each channel. I can use DAC...
I need to extend the range of my design based on NRF9E5.
I found this on dealextreme:
**broken link removed**
anyone has an idea of what is rf power amplifier on this board?
could anyone recommend a tested rf power amplifier IC for NRF9E5/NRF905 (868MHz) ?
Here is the solution from myself as a future reference to who faces with the same issue:
Nordic replied my support case. The problem was, NRF9E5 INT_0 and INT_1 external interrupts should be configured using P0_ALT register. If P0.3 and P0.4 pins are configured as I/O, they don't generate...
I'm trying to detect external interrupts using NRF9E5 / 8051 core RF transceiver microcontroller. Development environment is Keil C51
At first I was confused with ISR declarations:
void INT0_ISR( void ) interrupt 0 //0x03{
// Ext INT0 handler
}
void INT1_ISR( void ) interrupt 2...
delay_ms
Hi
I needed to create a simple delay subroutine by using dummy loops. I found some calculations and tested/working codes for LPC2148 on the net. Three of them are:
void delay_ms(long int ms)
{
long int i, j;
for(i=0;i for(j=0;j<6553;j++);
}
OR
void delay_ms(unsigned long int...
may be
- you forgot to clear interrupt event bits before returning interrupts. For instance if you defined a timer interrupt and if timer overflowed and caused and interrupt, interrupt mechanism sets lets say, TMR0IF bit. After you finish with interrupt handler, and if you don't clear this...
scheduler implementation
Hi all,
I'm implementing a Real-Time Task Scheduler using NXP LPC 2148 ARM7 CPU using GCC-Winarm.
The scheduler will be Rate Monotonic ( tasks with shorter periods have higher priorities ) and pre-emptive.
I already implemented rate-monotonism but I've problems with...
how to interface graphics lcd
https://www.sparkfun.com/Code/Nokia_LCD_driver.zip
Sparkfun has a working examplefor LPC2148and S1D5G00. You can check it from their website
lpc2148 rtos kernel
you can use Freertos + LPC2148 under windows too using WinARM. Try google. There are ready-to compile projects uses FreeRTOS + LPC2148
Edit after I got price quotation for wires and wire mounting service costs :) :
I want to do this with wireless communication. The points are not in line of sight, there is a small peak between nodes. How can I form reliable wireless serial communication between those two points? 9600bps is...
I need to form a serial communication between two points and looking for a solution. First I thougt convert my uart Rs232 to RS485 but this is limited with 1.2KM without repeaters. I can not use repeaters because the wires will be buried into ground with a pipe with 2.5m radius.
I also...
I've a design on ARM9 core running Linux on it.
I need to implement Bluetooth handsfree feature in this design.
I don't want to use an USB Bluetooth dongle. I need to let it work "on-board"
I seen some single chip solutions but they are expensive. It should be as cheap as an usual BT headset...
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