DATASHEET SRF08 PDF

Also there is no magic formula to say "use this gain setting with that range setting". It depends on the size, shape and material of the object and what else is around in the room. Try playing with different settings until you get the result you want. If you are in any doubt about the Range and Gain Registers, remember they are automatically set by the SRF08 to their default values when it is powered-up. You can ignore and forget about them and the SRF08 will work fine, detecting objects up to 6 metres away every 65mS or slower. The reading increases as the brightness increases, so you will get a maximum value in bright light and minimum value in darkness.

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Also there is no magic formula to say "use this gain setting with that range setting". It depends on the size, shape and material of the object and what else is around in the room. Try playing with different settings until you get the result you want. If you are in any doubt about the Range and Gain Registers, remember they are automatically set by the SRF08 to their default values when it is powered-up.

You can ignore and forget about them and the SRF08 will work fine, detecting objects up to 6 metres away every 65mS or slower. The reading increases as the brightness increases, so you will get a maximum value in bright light and minimum value in darkness.

It should get close to in complete darkness and up to about 0xF8 in bright light. It also gives a brief flash during the "ping" whilst ranging. Write the 3 sequence commands in the correct order followed by the address. Example; to change the address of a sonar currently at 0xE0 the default shipped address to 0xF2, write the following to address 0xE0; 0xA0, 0xAA, 0xA5, 0xF2.

These commands must be sent in the correct sequence to change the I2C address, additionally, No other command may be issued in the middle of the sequence. The sequence must be sent to the command register at location 0, which means 4 separate write transactions on the I2C bus.

When done, you should label the sonar with its address, however if you do forget, just power it up without sending any commands. One long flash followed by a number of shorter flashes indicating its address. The flashing is terminated immediately on sending a command the SRF

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Checking for Completion of Ranging You do not have to use a timer on your own controller to wait for ranging to finish. You can take advantage of the fact that the SRF08 will not respond to any I2C activity whilst ranging. Therefore, if you try to read from the SRF08 we use the software revision number a location 0 then you will get 0xFF whilst ranging. As soon as the ranging is complete the SRF08 will again respond to the I2C bus, so just keep reading the register until its not 0xFF anymore. You can then read the sonar data. Your controller can take advantage of this to perform other tasks while the SRF08 is ranging. By default, this is 65mS or the equivalent of 11 metres of range.

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Location 0 is the command register and is used to start a ranging session. It cannot be read. Reading from location 0 returns the SRF08 software revision. By default, the ranging lasts for 65mS, but can be changed by writing to the range register at location 2.

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