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How could have Banksy kept an RF receiver running for 12 years?
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I'm talking about Banksy's "Girl with balloon" painting that shredded itself at auction.
I think the general consensus is that he didn't, and that it was set up before the auction (or a couple years ago, not 12 years). But lets say he did, how could he have made it keep its power for that long? What sorts of RF receivers run on such low power? What batteries can withstand a 12 year low-but-constant-load life?
batteries rf low-power efficiency
asked 1 hour ago
Daffy
3961411
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up vote
3
down vote
favorite
I'm talking about Banksy's "Girl with balloon" painting that shredded itself at auction.
I think the general consensus is that he didn't, and that it was set up before the auction (or a couple years ago, not 12 years). But lets say he did, how could he have made it keep its power for that long? What sorts of RF receivers run on such low power? What batteries can withstand a 12 year low-but-constant-load life?
batteries rf low-power efficiency
asked 1 hour ago
Daffy
3961411
1
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
2
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
I'm talking about Banksy's "Girl with balloon" painting that shredded itself at auction.
I think the general consensus is that he didn't, and that it was set up before the auction (or a couple years ago, not 12 years). But lets say he did, how could he have made it keep its power for that long? What sorts of RF receivers run on such low power? What batteries can withstand a 12 year low-but-constant-load life?
batteries rf low-power efficiency
asked 1 hour ago
Daffy
3961411
I'm talking about Banksy's "Girl with balloon" painting that shredded itself at auction.
I think the general consensus is that he didn't, and that it was set up before the auction (or a couple years ago, not 12 years). But lets say he did, how could he have made it keep its power for that long? What sorts of RF receivers run on such low power? What batteries can withstand a 12 year low-but-constant-load life?
batteries rf low-power efficiency
batteries rf low-power efficiency
asked 1 hour ago
Daffy
3961411
asked 1 hour ago
Daffy
3961411
asked 1 hour ago
Daffy
3961411
asked 1 hour ago
Daffy
3961411
asked 1 hour ago
Daffy
3961411
3961411
1
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
2
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago
add a comment |Â
1
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
2
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago
1
1
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
2
2
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago
add a comment |Â
2 Answers
2
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oldest
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up vote
2
down vote
A relatively large lithium primary cell would be my choice. They are specified for something like 10 or 20 year life running water meters, including periodic radio communication. And maybe a second cell to run the motor so it stays relatively fresh.
The Israeli company Tadiran makes such products.
As long as the temperature does not get too high the shelf-ish life of such Lithium cells is in the decades (they claim 40 year operating life). You can bet that an expensive piece of art will be kept in carefully controlled temperature and humidity conditions.
Given that power source, power management would be important but not crazy critical. You would want to keep the average draw in the << 100uA range most likely. Doing the sums, their 19AH TL-4930 works out to 54uA (average) for 40 years. So even if it turned on a receiver once per 10 minutes for a second it could draw tens of mA, provided the sleep mode power was inconsequential.
answered 35 mins ago
Spehro Pefhany
196k4140391
add a comment |Â
up vote
1
down vote
Why would it be a low-but-constant-load life?
Assuming the auction takes hours, it would be enough to awake the RF receiver once every hour for a few ms to check for an RF signal.
The transmitter would either transmit the RF signal:
- For a complete hour, knowing the RF receiver will be awake at least once
- Know in what time period (like every whole hour) the receiver will be awake and send it within that time.
In both ways, the transmitter can continuously send the message, only the receiver needs to receive it only once.
answered 1 hour ago
Michel Keijzers
5,09662255
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
A relatively large lithium primary cell would be my choice. They are specified for something like 10 or 20 year life running water meters, including periodic radio communication. And maybe a second cell to run the motor so it stays relatively fresh.
The Israeli company Tadiran makes such products.
As long as the temperature does not get too high the shelf-ish life of such Lithium cells is in the decades (they claim 40 year operating life). You can bet that an expensive piece of art will be kept in carefully controlled temperature and humidity conditions.
Given that power source, power management would be important but not crazy critical. You would want to keep the average draw in the << 100uA range most likely. Doing the sums, their 19AH TL-4930 works out to 54uA (average) for 40 years. So even if it turned on a receiver once per 10 minutes for a second it could draw tens of mA, provided the sleep mode power was inconsequential.
answered 35 mins ago
Spehro Pefhany
196k4140391
add a comment |Â
up vote
2
down vote
A relatively large lithium primary cell would be my choice. They are specified for something like 10 or 20 year life running water meters, including periodic radio communication. And maybe a second cell to run the motor so it stays relatively fresh.
The Israeli company Tadiran makes such products.
As long as the temperature does not get too high the shelf-ish life of such Lithium cells is in the decades (they claim 40 year operating life). You can bet that an expensive piece of art will be kept in carefully controlled temperature and humidity conditions.
Given that power source, power management would be important but not crazy critical. You would want to keep the average draw in the << 100uA range most likely. Doing the sums, their 19AH TL-4930 works out to 54uA (average) for 40 years. So even if it turned on a receiver once per 10 minutes for a second it could draw tens of mA, provided the sleep mode power was inconsequential.
answered 35 mins ago
Spehro Pefhany
196k4140391
add a comment |Â
up vote
2
down vote
up vote
2
down vote
A relatively large lithium primary cell would be my choice. They are specified for something like 10 or 20 year life running water meters, including periodic radio communication. And maybe a second cell to run the motor so it stays relatively fresh.
The Israeli company Tadiran makes such products.
As long as the temperature does not get too high the shelf-ish life of such Lithium cells is in the decades (they claim 40 year operating life). You can bet that an expensive piece of art will be kept in carefully controlled temperature and humidity conditions.
Given that power source, power management would be important but not crazy critical. You would want to keep the average draw in the << 100uA range most likely. Doing the sums, their 19AH TL-4930 works out to 54uA (average) for 40 years. So even if it turned on a receiver once per 10 minutes for a second it could draw tens of mA, provided the sleep mode power was inconsequential.
answered 35 mins ago
Spehro Pefhany
196k4140391
A relatively large lithium primary cell would be my choice. They are specified for something like 10 or 20 year life running water meters, including periodic radio communication. And maybe a second cell to run the motor so it stays relatively fresh.
The Israeli company Tadiran makes such products.
As long as the temperature does not get too high the shelf-ish life of such Lithium cells is in the decades (they claim 40 year operating life). You can bet that an expensive piece of art will be kept in carefully controlled temperature and humidity conditions.
Given that power source, power management would be important but not crazy critical. You would want to keep the average draw in the << 100uA range most likely. Doing the sums, their 19AH TL-4930 works out to 54uA (average) for 40 years. So even if it turned on a receiver once per 10 minutes for a second it could draw tens of mA, provided the sleep mode power was inconsequential.
answered 35 mins ago
Spehro Pefhany
196k4140391
answered 35 mins ago
Spehro Pefhany
196k4140391
answered 35 mins ago
Spehro Pefhany
196k4140391
answered 35 mins ago
Spehro Pefhany
196k4140391
196k4140391
add a comment |Â
add a comment |Â
up vote
1
down vote
Why would it be a low-but-constant-load life?
Assuming the auction takes hours, it would be enough to awake the RF receiver once every hour for a few ms to check for an RF signal.
The transmitter would either transmit the RF signal:
- For a complete hour, knowing the RF receiver will be awake at least once
- Know in what time period (like every whole hour) the receiver will be awake and send it within that time.
In both ways, the transmitter can continuously send the message, only the receiver needs to receive it only once.
answered 1 hour ago
Michel Keijzers
5,09662255
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
add a comment |Â
up vote
1
down vote
Why would it be a low-but-constant-load life?
Assuming the auction takes hours, it would be enough to awake the RF receiver once every hour for a few ms to check for an RF signal.
The transmitter would either transmit the RF signal:
- For a complete hour, knowing the RF receiver will be awake at least once
- Know in what time period (like every whole hour) the receiver will be awake and send it within that time.
In both ways, the transmitter can continuously send the message, only the receiver needs to receive it only once.
answered 1 hour ago
Michel Keijzers
5,09662255
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
add a comment |Â
up vote
1
down vote
up vote
1
down vote
Why would it be a low-but-constant-load life?
Assuming the auction takes hours, it would be enough to awake the RF receiver once every hour for a few ms to check for an RF signal.
The transmitter would either transmit the RF signal:
- For a complete hour, knowing the RF receiver will be awake at least once
- Know in what time period (like every whole hour) the receiver will be awake and send it within that time.
In both ways, the transmitter can continuously send the message, only the receiver needs to receive it only once.
answered 1 hour ago
Michel Keijzers
5,09662255
Why would it be a low-but-constant-load life?
Assuming the auction takes hours, it would be enough to awake the RF receiver once every hour for a few ms to check for an RF signal.
The transmitter would either transmit the RF signal:
- For a complete hour, knowing the RF receiver will be awake at least once
- Know in what time period (like every whole hour) the receiver will be awake and send it within that time.
In both ways, the transmitter can continuously send the message, only the receiver needs to receive it only once.
answered 1 hour ago
Michel Keijzers
5,09662255
answered 1 hour ago
Michel Keijzers
5,09662255
answered 1 hour ago
Michel Keijzers
5,09662255
answered 1 hour ago
Michel Keijzers
5,09662255
5,09662255
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
add a comment |Â
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
3
3
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
And, you can shut off the receiver entirely if the picture hasn't moved in a day or two. The receiver only needs to be on if the picture has moved. If it's hanging quietly on the wall, it isn't at auction. If it is moved around, it might be on the way to auction.
– JRE
1 hour ago
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
@JRE And I guess a circuit activated by some sort of accelerometer can be very low power when it's not moving.
– kasperd
just now
add a comment |Â
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1
Extrapolate from smoke detectors. Hint: very hard it is. You need at least special batteries and I don't know if micros good enough have been available 12 years ago.
– PlasmaHH
1 hour ago
Hypothetical question so pretty pointless and opinion based IMO.
– pipe
1 hour ago
2
Another thought: A simple passive AM receiver that needs no batteries. You transmit an AM signal that wakes up the coded receiver. If it wakes it up accidentally, no problem as it was only on for a few seconds (or less.)
– JRE
59 mins ago