I found tinygps in arduino did not fit my needs, I wrote my own. It is possible to suppress nmea "sentences" and make this into a master/slave where you make PUBX requests and process the response, otherwise this thing does not shut up and overruns the processor and buffer, leaving no cycles for anything other than serving a flood of packets. My code for GPS synced epoch time is on github. Dave in SD
Here is a headstart if interested:
onstart
//RMCx5 slows RMC to every 5 cycles...
//time info may be ephemeral (warm start) time may be from a 2d fix, check GSA
sprintf(pubx40,"$PUBX,40,RMC,0,5,0,0,0,0"); //page 82
if (SetCheckSum(pubx40, sizeof(pubx40))) {
String sPubx=pubx40;
Serial.print(sPubx);
gpsSerial.print(sPubx);
}
//noGSV turns off GSV a useless sentence, just because a satellite is in view does not make for fixed
sprintf(pubx40,"$PUBX,40,GSV,0,0,0,0,0,0");
if (SetCheckSum(pubx40, sizeof(pubx40))) {
String sPubx=pubx40;
Serial.print(sPubx);
gpsSerial.print(sPubx);
}
bool SetCheckSum(unsigned char *pPacket, int bufferSize){
bool bResult=false;
//packet sent with five extra spaces -and- without an asterick 0x26 CR_A CR_B 0x0d 0x0a
int iSize=strlen(pPacket);
if ((iSize+5)<=bufferSize){
//do not include $
int iChecksum = 0;
for (int x=1;x<iSize;x++){
iChecksum = iChecksum ^ (byte)pPacket[x]; //xor
}
char Calc[3];
sprintf(Calc,"%02X",iChecksum);
pPacket[iSize]='*';
pPacket[iSize+1]=Calc[0];
pPacket[iSize+2]=Calc[1];
pPacket[iSize+3]=0x0D;
pPacket[iSize+4]=0x0A;
bResult=true;
}
return bResult;
}
bool CheckSum(String sPacket){
bool bResult=false;
int iSize=sPacket.length();
if (iSize>10){
int iAstericks=sPacket.indexOf('*');
if (iAstericks>0){
String sCS=sPacket.substring(iAstericks+1,iAstericks+3);
//xor bytes between $ and *
sPacket=sPacket.substring(1,iAstericks);
iSize=sPacket.length();
int iChecksum = 0;
for (int x=0;x<iSize;x++){
iChecksum = iChecksum ^ (byte)sPacket[x]; //xor
}
//yeah, this could be better... think i got the false negatives; case and < 0x10
char Calc[3];
sprintf(Calc,"%02X",iChecksum);
bResult=sCS==Calc;
}
}
return bResult;
}
in your loop
maintain a global buffer building sentences from chipset
a complete packet starts with $ and ends with 0x0d 0x0a, check the sentence checksum then process based on sentence type
https://content.u-blox.com/sites/default/files/products/documents/u-blox6_ReceiverDescrProtSpec_%28GPS.G6-SW-10018%29_Public.pdf
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This Item  GPS Module Receiver,Navigation Satellite Positioning NEO-6M (Arduino GPS, Drone Microcontroller, GPS Receiver) Compatible with 51 Microcontroller STM32 Arduino UNO R3 with Antenna High Sensitivity | Recommendations  |  |  |  |  | |
| Price | $12.99 | $18.99 | $17.99 | $18.99 | $18.99 | $15.99 |
| Delivery | Get it as soon as Wednesday, Jul 2 | Get it as soon as Wednesday, Jul 2 | Get it as soon as Wednesday, Jul 2 | Get it as soon as Wednesday, Jul 2 | Get it as soon as Wednesday, Jul 2 | Get it as soon as Wednesday, Jul 2 |
| Customer Ratings | ||||||
| Sold By | Deegoo-FPV | Deegoo-FPV | Shutao | Douguo | HANXI01 | HANXI01 |
| control method | — | touch | touch | application | touch | application |
| mounting type | found in image, Dashboard Mount | Dashboard Mount, Panel Mount | Dashboard Mount, Panel Mount | Panel Mount | found in image, Dashboard Mount | Panel Mount |
| batteries included | ✓ | ✓ | ✗ | ✓ | ✗ | ✓ |
Product Description
Details
Operating voltage: 3.6V-5V (or direct usb power supply)
Operating baud rate: 9600 (can be modified)
Onboard rechargeable button battery
Onboard E2PROM can save parameter data
NEMA output format is compatible with NEO-6M
Application areas:
Vehicle-mounted, Handheld devices such as PDAs, Vehicle monitoring, Mobile phones, camcorders and other mobile positioning systems, Sharing bike,Sharing mobile power
Product information
| Product Dimensions | 1.06 x 1.06 x 1 inches |
|---|---|
| Item Weight | 0.563 ounces |
| ASIN | B084MK8BS2 |
| Customer Reviews |
4.4 out of 5 stars |
| Date First Available | February 10, 2020 |
| Manufacturer | Deegoo-FPV |
| Country of Origin | China |
Warranty & Support
Product Warranty: For warranty information about this product, please click here
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Tiny - But Picks Sats Pretty Well with INAV / RC Plane
OVERVIEW: Took a risk on this and glad I did. Put this in a Volantex Ranger 2000 and soldered to a Matek F722 WPX wing flight controller. This thing got a GPS lock in the basement with the antenna upside down. In the Chicago area I get about 8 sats within two mins of firing it up In the photo you can see that it is mounted underneath two pieces of velcro, the fuselage, and the 3d printed canopy. Easily maintains 8 to 13 satellites Since this is going in an RC plane and or quad, it is great that it has solder pads..
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