Introduction: How to Modify RC CAR Via 2.4 GHz NRF24L01 Arduino Part2 Reciever(Rx)
This is the continued instruction of "How to Modify RC CAR Via 2.4 GHz NRF24L01 Arduino Part1 Transmitter(Tx)"
The instruction will advice how to build 2.4 GHz system receiver that basically use in rc car today.
Thank to arduino-info.wikispaces.com , github.com/maniacbug/RF24 for RF24library and other nRF24L01 module information.
You can purchase electronic parts from Aliexpress, Banggod,Ebay,etc.
Project more : http://hobbywitch666.blogspot.com
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Step 1: Materials & Tools
1. 1 - Arduino controller - UNO (Nano and Pro mini cannot use)
2. 1 - NRF24L01 module
3. 1 - Socket adapter for NRF24L01
4. 4 - LED 4 mm. (1-couple of White and 1-couple of Red)
5. 2 - Resistor 1 kOhm. 1/4 watt.
6. 1 - Capacitor 0.1 microF 16V.
7. 3 - Capacitor 1 microF 16V.
8. 1 - Capacitor 220 microF 20V.
9. 1 - L293D H-bridge dual motors drive IC
10. 1 - 16-Pins DIP IC Sockets Adaptor(For L293D)
11. Dupont wires
12. Male pin header
13. Female pin header
14. Dupont Jumper Cable Housing Male Pin Connector
15. Dupont Jumper Cable Housing Female Pin Connector
16. Heat shrink tube 2.5 mm.
17. PCB - DIY circuit board
18. Battery Lipo 7.4 V. 1000 mAh. (2 cell)
19. Male JST Battery Pigtail
20. 1 - RC car toy (H-bridge dual motor radio control)
1. Soldering gun.
2. Soldering wire.
3. Soldering paste.
4. Screw driver.
6.Hot glue gun.
Step 2: Electronic Parts Installation & DIY Shield
Arduino UNO to L293D (Make DIY shield)
UNO pin - to - L293D pin
3 - 2
4 - 7
6 - 15
7 - 10
1 - 5V. supply(+Capacitor 1 mF/16V)
3 - Steering Motor
4 - GND
5 - GND
6 - Steering Motor
8 - 7.2 V. Batt.+(+Capacitor 220 mF/20V)
9 - 5V. supply(+Capacitor 1 mF/16V)
11 - Driving Motor
12 - GND
13 - GND
14 - Driving Motor
16 - 5V. supply(+Capacitor 1 mF/16V)
nRF24L01 module to Arduino UNO
pin No :
Vcc - 5 V. pin(+Capacitor 0.1 mF/16V)
GND - GND
CE - 9
CSN - 10
SCK - 13
MO - 11
MI - 12
IRQ - 2
*If you have communication problem,you can change connection from UNO pin 13,11,12 to pin SCK,MOSI,MISO of UNO programming pins.
*It's necessary to add 0.1 microF/16V to nRF24L01 module pin Vcc/GND because the module needs high continuous current and stable voltage.
+Solder a solid copper wire on nRF24L01 module antenna can improve remote range more.
*Soldering all devices carefully ,use enough large wire.Making good ground otherwise it will has ghost input signal.
*Before connecting main supply,check out to find short circuit points on DIY shield.Otherwise it can smoke and burn everything.(Be careful of Lipo battery , it's high current supply , short contact will spark fire)
Step 3: Software Download & Upload to Receiver(Rx)
Arduino sketch and Library :
Refer to previous instruction part 1.Just do the same step from 1-5. except changing to upload this attached Rx sketch.
*File printf.h is not necessary for 2 pipes communication.
After uploading,turn on the transmitter(Tx),if everything correct the serial monitor will show data as introduction video clip.
If there is nothing,the communication between Tx and Rx does not complete ,back to check out hardware and electronic parts installation.